Baking sheets come in a variety of sizes: full sheets (26 x 18"), half sheets (18 x 13"), and quarter sheets (13 x 9"). The ...

Preheat the oven to 190C/170C Fan/Gas 5 and line a 23x33cm/9x13in Swiss roll tin with baking paper. Place the eggs, sugar and vanilla seeds into a bowl and whisk until very pale, fluffy and thickened.