Step 1

Combine sugar, lemon rind, lemon juice and half the raspberries in a saucepan over medium heat. Stir for 3 mins or until sugar dissolves. Increase heat to medium-high and bring to the boil. Cook for 6-8 mins or until syrup thickens and raspberries soften. Strain through a fine sieve into a heatproof jug. Discard solids. Set aside to cool.

Step 2

Grease a 12-hole, ½-cup (125ml) silicon muffin pan. Process the biscuits in a food processor until crushed. Add the butter and pulse until mixture just comes together. Spoon the biscuit mixture evenly among prepared holes. Use the back of a spoon to press biscuit mixture into holes. Place in the freezer for 30 mins or until firm.

Step 3

Use an electric mixer to beat the condensed milk and cream in a bowl until stiff peaks form. Fold in two-thirds of raspberry puree to marble. Spoon over biscuit bases in pan. Smooth the surface. Freeze for 6 hours or until firm.

Step 4

Transfer cakes to a serving platter. Set aside for 5 mins to soften slightly. Drizzle with remaining raspberry puree and top with the remaining raspberries. Dust with icing sugar to serve.