- Preheat oven to 150°C.
- To make the base, place the ground almonds, flour, sugar and butter into a bowl. Rub mixture with your fingertips until it forms coarse crumbs.
- Line the base of a 20cm spring form tin with non-stick baking paper. Place the base mixture in the tin and press gently with fingers until even and then smooth out with the back of a spoon. Bake for 15 minutes or until light golden, set aside.
- To make the filling, place the cream cheese, ricotta, eggs, sugar, lemon rind, juice and vanilla in a food processor. Combine the cornflour and water until smooth and add to the cheese mixture. Process the mixture until smooth.
- Grease the sides of the cake tin with a little butter and then pour the filling over the base. Tap lightly to remove any air bubbles. Bake for 1 hour. Turn the oven off and stand the cake in the oven for 1 hour, leaving the door closed. Refrigerate until cold and serve with fresh berries.