Mix 1 teaspoon of coffee powder, sugar and 3 tablespoons of hot water. Add the liqueur. Stir ice and 3 teaspoons of coffee powder with the whisk of the hand mixer until creamy. Put half of the ice cream in an ovenproof dish (approx. 1500 ml content) and smooth it down. Spread the biscuits on the ice cream, pressing them lightly into the ice cream and sprinkle with coffee-liqueur mixture. Put the remaining ice cream on the biscuits, smooth it down and put them in the freezer immediately for 3-4 hours. Dust with cocoa before serving
4 hours waiting time