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Instructions:
1. Let’s start by preparing the base of the roll. Finely chop the dry biscuits in a mixer or put them in a food bag and crush them with a rolling pin until they are reduced to fine crumbs.
2. Transfer the cookie crumbs to a bowl and add the melted butter. Mix well until the mixture is smooth.
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3. Line a rectangular baking sheet with parchment paper and spread the cookie mixture evenly across the bottom of the pan. Press down firmly with the back of a spoon to compact the base. Refrigerate for 30 minutes to solidify the base.
4. Meanwhile, prepare the chocolate cream. Chop the dark chocolate and place it in a heatproof bowl.
5. In a saucepan, heat the whipping cream without boiling it. When condensation begins to form on the edges, pour it over the chopped chocolate. Let it sit for a few minutes, then mix gently until you obtain a smooth and homogeneous cream.