Peel core and quarter 3 or 4 pears – enough to cover the bottom of a 20cm/8 inch cake pan. I use a silicon one, but if not, grease it well, and I’d line it with baking parchment.
In a food processor, combine 175g of butter and 175g of caster sugar until fluffy and soft. Add 2 eggs, and blitz again, then add another egg, 175g of self raising flour, and 1 tsp vanilla extract. Pulse till combined.
Spread the mixture over the pears, and bake at gas mark 4 / 180° for 45-50 minutes. Leave to cool for about 5 minutes, then turn out on to a plate.