Preheat the oven to 150°C/ 130°C fan/ gas mark 2/ 300°F
Set out 12 paper cases in the bun tin
For the buns and filling:
Beat the cake ingredients vigorously, e.g. in a processor or mixer, or with a hand mixer(Butter, caster sugar, egg yolk, vanilla extract, flour, cornflour)
When you have a stiff-ish dough, pinch a piece off and roll it in your hands to make a ball that will half-fill a paper case. Put the dough in a paper case and make hollow in the centre with your finger or the end of a wooden spoon
Spoon about ¼ teaspoon jam into the hollow.
For the topping:
Whip the egg white until it is stiff and holds its shape
Gently fold in the sugar and ground almonds using a metal spoonUse the edge of the spoon to cut through the mixture as you mix it. The aim is to keep the volume in the egg whites
Pile the topping onto the buns
Cook for 50-60 minutes until beginning to brown
Leave to cool in the tin for 15 minutes before turning out onto a wire cooling rack.