How to make our vibrant, fruit-forward mirror glazes

I want to bake cakes that look like a piece of art, the kind that will make people pause to say, “Wow.”  But I also want to feel confident in their flavor, knowing that when people take a bite, they’ll realize the cake has both style and substance, as Paul Hollywood would say.  

The good news? There’s a way to make professional-looking cakes that taste delicious too: just finish them with our new Berry Mirror Glaze.  

Photography by Jenn Bakos; Food Styling by Lydia Fournier

What is mirror glaze? 

“Mirror glaze” may conjure up images of glossy, glittery, technicolored cakes that are eerily reminiscent of a bowling ball. That’s one kind of mirror glaze — it’s made from white chocolate and typically uses artificial colors, gels or gums, and edible glitter to create noticeable shine and bright color. It’s usually poured over cakes to fully enrobe them, creating a unique design and reflective surface. Despite the eye-catching appearance, traditional mirror glaze isn’t known for tasting particularly good — a major drawback when it comes to making cake. 

Our Berry Mirror Glaze, on the other hand, is different. The vibrant color comes entirely from berry purée, which has the added bonus of tasting incredibly fresh and flavorful, like a whole pint of berries in one bite.  

Photography by Jenn Bakos; Food styling by Lydia Fournier

Unlike traditional mirror glazes, you can use our berry version to enhance the flavor of the overall cake. Lemon sponge cake with blueberry mirror glaze, anyone? How about chocolate cake with a raspberry mirror glaze? The flavor possibilities are enticingly endless.

How to make Berry Mirror Glaze 

Berry Mirror Glaze isn’t difficult to make, but it does require some precision. For best results, follow the recipe closely. 

Photography by Jenn Bakos; Food styling by Lydia Fournier

We’ve added step-by-step photos to the recipe page to help guide you along the way; check it out for detailed instructions about how to make Berry Mirror Glaze. Here are a few key considerations to set yourself up for success, along with some inspiration for how to use this gorgeous berry concoction. 

Start with quality purée 

Berry purée is the base of this recipe, so it’s important to use quality ingredients here. Purée can be purchased online and frozen for months while retaining its fresh fruit flavor. Our Test Kitchen loves using fruit purées made by Ravifruit. (Heads up: At King Arthur, we only recommend the products that we, as bakers, truly love. When you buy through external links on our site, we may earn an affiliate commission.) 

If you’re looking for a less expensive option, you can also make your own purée. It’s easy to do but takes a little advance planning and a lot (20 ounces) of berries. Conveniently, both fresh and frozen berries work beautifully to make a full-flavored purée. Simply thaw frozen berries before using. (Don’t drain any of the liquid that separates during thawing.)  

Purée the fresh or thawed fruit in a food processor or blender until smooth, then add 1/4 cup (50g) granulated sugar and pulse until smooth. Add a squeeze of fresh lemon juice to brighten the flavor of your berries, if you’d like
Homemade berry purée should be used shortly after it comes out of the food processor/blender. (Certain berries will start to set and/or separate with time.) That being said, homemade purée can be made a few days in advance and stored in the refrigerator if it's re-blended before use.

5 ways to decorate with mirror glaze 

Once you’ve mastered the process of making mirror glaze, there are countless ways to use it. Here are five ways to use mirror glaze that range from a straightforward full-coverage coating to an over-the-top tie-dye cake.  

1. Full cake coverage: One of the easiest, most beautiful ways to use mirror glaze is to entirely coat a cake. Start with a cake that’s fully coated in smooth frosting — this is not the time to use a “naked cake,” one that only has a very thin layer of frosting on the outside. The frosted cake should be chilled in the freezer for at least 30 minutes. Set it on a cooling rack over a baking sheet lined with parchment to catch the excess glaze. (See the tips from our recipe developer below for details.) 

   Photography by Jenn Bakos; Food Styling by Lydia Fournier

   Pour the warm (85°F to 88°F) glaze from a measuring cup with a spout (for a cleaner pour) over the chilled cake, starting in the center and moving in a circular motion toward the edges. Continue pouring until the entire cake is coated and no bare spots of frosting show through. Allow the cake to come to room temperature before serving.

2. Drip border: Use the same setup and approach as you would to fully coat a cake, but pour the glaze more slowly and use less overall.

   Photography by Jenn Bakos; Food Styling by Lydia Fournier

   The glaze will continue to spread and move down the sides of the cake after you’ve stopped pouring, so cut yourself off a bit before you’re satisfied. (It’s like carryover cooking, but for glazing — carryover glazing!)  

   Photography by Jenn Bakos; Food styling by Lydia Fournier

3. Cupcake dip: Berry Mirror Glaze isn’t a treatment only reserved for cakes — cupcakes can get this flavorful finish as well. Frost your cupcakes with a generous amount of your favorite frosting, then freeze them for at least 30 minutes. Bring the glaze to the right temperature (between 85°F and 88°F) by reheating it in short bursts in the microwave and stirring periodically, then transfer it to a large liquid measuring cup.

   Photography by Jenn Bakos; Food styling by Lydia Fournier

   Once the cupcakes are chilled, dip their tops into the warm glaze so that almost all of the frosting is immersed. Remove the cupcake from the glaze and let any excess drip off for a few seconds before turning it right-side-up.

   Photography by Jenn Bakos; Food styling by Lydia Fournier

4. Marbled cake: For a next-level technique, try combining two or more flavors of mirror glaze to get a swirled, tie-dye effect. Start by ensuring your glazes are all at the right temperature, then pour a portion of the first flavor of glaze into a large measuring cup. (You want to use roughly equal parts for each flavor, and you’ll want about 1 1/2 cups of glaze total to fully coat an 8” or 9” round layer cake.) 

   Pour the next flavor of mirror glaze directly into the center of the previous color in the same measuring cup, layering the two glazes atop one another. Repeat with the third flavor, if using.

   Photography by Jenn Bakos; Food Styling by Lydia Fournier

   Once you’ve layered your colors in a single measuring cup, pour the multi-colored glaze over the chilled cake as you would if you were covering it completely with a single color.

   Photography by Jenn Bakos; Food styling by Lydia Fournier

5. Give other desserts a glossy finish: While mirror glaze is most commonly used on cakes, you’re not limited to only using it this way. Mirror glaze can be poured over all kinds of desserts, including mousse-based desserts and even fuit- or custard-based bars. Take our Raspberry-Lime Rickey Bars, for example.

   Photography by Rick Holbrook; Food Styling by Kaitlin Wayne

   Just be sure any dessert that's going to be finished with mirror glaze is thoroughly chilled, and that the glaze is between 85°F to 88°F before using.

Tips from the recipe developer 

This Berry Mirror Glaze was dreamed up and painstakingly tested by Recipe Tester Lydia Fournier. She made countless batches — at one point she was literally surrounded by five containers of different flavors, practically up to her elbows in it.  

Photography by Jenn Bakos; Food Styling by Lydia Fournier

Here are Lydia’s master tips for making picture-perfect cakes finished with Berry Mirror Glaze: 

1. Nice and smooth: Use frosting that’s easy to spread smooth and holds up well when chilled. Good options are our Swiss and Italian Buttercream recipes. Using frosting that’s white (as opposed to chocolate brown or buttery yellow) will ensure the color of the glaze pops.  

   Photography by Jenn Bakos; Food styling by Lydia Fournier

   Before chilling the cake, use an offset spatula or bench knife to make the frosting as smooth as possible. A flawless base of frosting sets you up for an even final coat of mirror glaze and a striking finish. 

2. Strain as desired: Use a rubber spatula or small whisk to push the glaze through a strainer (step 6 in the recipe) more quickly. It can get quite thick, and you’ll end up waiting forever for it to strain through on its own.  

   Photography by Jenn Bakos; Food Styling by Lydia Fournier

   You can also skip the straining step altogether if you’re looking for a glaze with a more rustic, textured appearance. But if it’s the super-smooth and shiny mirror finish you’re looking for, be sure to thoroughly strain the glaze before using. 

3. Chill out: Be sure the cake is thoroughly chilled, or the glaze will melt the frosting. Don’t remove the cake from the freezer until the glaze is the right temperature, your equipment is in place, and you’re ready to pour.

4. Use your tools: Use a scale to measure your ingredients by weight and a digital thermometer for best results. Accuracy pays off in this recipe, so take accurate temperature readings of your glaze often. (It should be between 85°F and 88°F when ready to use.)

5. Berries are best: Some recipes can be riffed on with different flavors — but this isn’t one of them. Other fruit purées won’t work the same way because of varying levels of acidity, pectin, and enzymes that can break down the gelatin in the glaze. Stick with purée made from berries (not other fruits) for best results.

   Photography by Jenn Bakos; Food styling by Lydia Fournier

   Bonus: The one exception to the berry-only rule is mango purée. You can use 1 cup plus 2 tablespoons (300g) of mango purée (not mango nectar) in place of the berry purée in this recipe with good results. 

6. Harvest excess: This recipe is designed to make excess — it’s easier to fully coat a cake if you continuously pour a steady stream of glaze and revisit any places that seem thin. Don’t be alarmed when you end up with lots of glaze pooled in the baking sheet under the cooling rack. This is supposed to happen. 

   Photography by Jenn Bakos; Food styling by Lydia Fournier

   Let the glaze set for about 5 to 10 minutes; it’s easier to clean up if it’s in a gel-like state. Then use the parchment paper to make a cone and squeeze the glaze into a storage container. Leftover glaze can be kept at room temperature in an airtight container for at least a week and in the freezer for at least a month. It’s easy to reheat and holds up well, so consider making a big batch. 

7. Stirred, not whisked: When reheating leftover glaze, stir it with a rubber spatula as opposed to a whisk to avoid incorporating air bubbles. (Any air bubbles will be visible in the final coating of glaze and mar the smooth surface.) 

Troubleshooting mirror glaze 

Don’t get discouraged if the first time you use Berry Mirror Glaze to finish a cake, it doesn’t turn out perfectly. It takes a bit of practice to apply flawlessly. 

One of the most common pitfalls of mirror glaze is pouring when it’s not the right temperature. If it’s not within the 85°F to 88°F window, it won’t coat the cake correctly.  

Photography by Jenn Bakos; Food Styling by Lydia Fournier

If the glaze is too cold, it'll clump in sections and be unevenly thick. Unfortunately, if you’ve already poured the glaze and it clumps, it’s difficult to fix. It’s best to take note for the future and be sure it’s a bit warmer next time.

Photography by Jenn Bakos; Food Styling by Lydia Fournier

If the glaze is too warm, it’ll be unevenly thin in spots and will slide off the sides of the cake. It can even start to melt the frosting, which can turn into a buttery, melty mess.  

Photography by Jenn Bakos; Food Styling by Lydia Fournier

If this happens, re-chill the entire cake for at least 10 to 15 minutes, allow the glaze to cool until it’s within the proper window, and then pour a second coating of glaze over the top to even things out.

But take heart; even if your first glazed cake isn’t as flawless as a mirror, it’s going to be bursting with berry flavor. It’ll have a vibrant color and enticing shine, like that of a well-polished apple — and even better fruit flavor. 

Photography by Jenn Bakos; Food Styling by Lydia Fournier

Give our Berry Mirror Glaze a try and share photos of your glazed cakes with us on Instagram and Facebook by using #kingarthurbaking. We can’t wait to see what you create!  

Cover photo by Jenn Bakos; food styling by Lydia Fournier.