Line your square cake tin with baking paper and set aside.
Blend all base ingredients, scoop out into baking tray and press down with your fingers then place in freezer.
Blend all filling ingredients until creamy, pour onto base, smooth over with the back of a spoon and place in freezer for at least 4 hours or you can leave overnight.
Take out of freezer and cut into squares. Top with your garnish and enjoy!!