This is a shortcake base with a fluffy marshmallow topping that when set you cut into either squares or bars. I used to make this once a week when my girls were young so this recipe has been around in my handwritten cookbook for many years. I originally got it from a friend who even today still does a lot of 'home baking' as she lives in the country on a farm. Her tins are always full! Note:- My slice tin is 30cm long x 20cm wide x 2.5cm high.