Serves: 16 triangles / Preparation time: 10 minutes / Cooking time: 20-25 minutes
- Preheat the oven to 180°C/fan 160°C/Gas 4. Line a baking tray with greaseproof and baking paper.
- Beat the butter, sugar, zest and vanilla together until fluffy. Add the remaining ingredients and mix to make a dough.
- Divide into 2, shape 1 piece into a circle and flatten until 20cm in diameter. Repeat with the other half. Score each one into 8 triangles and crimp the edges. Prick with a fork and chill for 5 minutes.
- Bake for 20-25 minutes. Sprinkle with caster sugar and leave to cool slightly, then cut into triangles while still warm.