METHOD
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berry sauce
Cut the strawberries in half and add them to a saucepan with the raspberries. Add powdered sugar, grated lemon zest, and lemon juice. Place over medium heat, bring to a boil and simmer for 10 minutes. When the sauce is cooked, strain it through a sieve into a bowl and set it aside to cool.
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Cookie base
Add the butter cookies to a freezer bag and seal it. Lay it flat on your counter. Using a rolling pin, crush the cookies to get little crumbs. Optionally, use a food chopper. Add the cookies to a bowl and add whipping cream; stir to combine. Transfer the cookies to a 20 cm (8-inch) round Cake Pan with a Removable Bottom. Press the cookie mixture using a glass to get an even, tight cookie base for the cake.
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Berry Icebox Cake
Spread half of the prepared berry sauce all over the cookie base. Using an ice cream scoop, arrange the vanilla ice cream on top and level it using a small spatula. Add strawberry ice cream and the rest of the berry sauce, and even it using a small spatula. Place in the freezer for 4 hours or overnight.
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Decorate
Grate the dark chocolate with hazelnuts over the cake. Decorate with fresh berries and serve as soon as possible. Keep in your freezer on a flat surface until serving.