By Lulu Grimes
These small, crisp, round biscuits are made from butter, sugar, egg, vanilla and flour. Fresh from the oven, they are soft and pliable, but become brittle after a few minutes. As their name suggests they melt in your mouth when eaten. The version, given here, is more like a very crumbly shortbread, often sandwiched together with a cream filling such as passionfruit.