Mirror Glaze Cake: How to Make It at Home
TLDR: Mirror glaze needs a frozen mousse cake, a 35°C glaze (white chocolate, sugar, condensed milk, gelatine, water), and confident pouring. Freeze overnight, glaze at 35°C, catch drips, decorate quickly before it sets.
What Is Mirror Glaze?
Mirror glaze is a shiny gelatine-based glaze poured over a frozen mousse or buttercream cake to create that ultra-reflective finish you see all over Instagram. It’s not icing - it’s a thin shell that sets as it hits the cold surface. The classic base is white chocolate, sugar, sweetened condensed milk, gelatine and water, coloured with oil-based food colouring like Colour Mill for vibrant colour without splitting.
What Cake Works Best Underneath?
Mirror glaze only works on a frozen, perfectly smooth cake. Any bump shows. Most bakers use an entremet or mousse cake: biscuit base, mousse layers, insert, then a thin mousse coat frozen solid overnight. You can glaze a buttercream cake if you freeze it until rock hard and smooth - but mousse gives the best mirror.
5-Ingredient Mirror Glaze Recipe
- 100g water, 150g sugar, 150g glucose syrup - boil to 103°C
- 100g sweetened condensed milk
- 10g gelatine (bloomed in 50g water)
- 150g white chocolate, chopped
- Colour Mill or gel colour as needed
Pour hot sugar over condensed milk, gelatine, chocolate. Emulsify with stick blender - tilt blender to avoid bubbles. Add colour. Strain. Cool to 35°C exactly - too hot it slides off, too cold it wrinkles.
How to Glaze Like a Pro
1. Freeze cake overnight on a board, on a wire rack over a tray.
2. Have glaze at 33-35°C. Test flow on side of jug - should coat back of spoon.
3. Pour in one confident motion from centre out. Let it flow over edges. Don't touch.
4. For marble effect, pour 2-3 colours in same jug barely swirled, then pour.
5. Pop air bubbles with toothpick, slide spatula under to trim drips at base. Move to serving board while still soft.
Troubleshooting: Why Did My Glaze Fail?
Transparent / slides off: Cake not frozen enough, or glaze too hot.
Wrinkly / thick: Glaze too cold (below 30°C) or over-blended with air.
Bubbles: Blender angle wrong - keep submerged, strain through sieve.
Matte not shiny: Condensed milk ratio off or over-mixed after cooling.
What You Need From Baking Pleasures
Grab white chocolate candy melts or couverture, gelatine leaves, a thermometer, and Colour Mill oil-based colours - they stay true in white chocolate. Add silicone entremet moulds and edible glitters for galaxy effects. Full kit in-store and online.