- 225g plain flour (use Italian 00 if you can find it - a very fine pastry flour)
- 250g caster sugar
- 250g unsalted butter, cubed
- 6 large egg yolks
Preheat oven to 190C. Line a 23cm springform pan.
Sift flour if using ordinary plain flour (not if using 00). Stir in sugar then add butter and egg. Reserve 1 tsp egg yolk. Use hands to knead the dough. Alternatively, you could use the dough hook on an electric mixer. Knead/mix until smooth.
Scoop dough into pan and smooth out. Mix the reserved egg with 1 tbsp water to make a glaze and brush over the gateau.
Bake for 15 minutes, then turn down oven to 180C (170C fan-forced) and bake a further 25 minutes until it's golden and firm to touch. Cool completely in tin before removing so that it doesn't fall apart.
This is a brilliant after-dinner treat topped with berries or makes a delicious mid-morning treat.