340g unsalted vegan butter
165g golden caster sugar
340g plain flour
165g cornflour
Zest 3 limes
1 tbsp vanilla bean paste of vanille essence
Cream the butter and sugar until light and fluffy, then add the dry ingredients, followed by the lime zest and vanilla bean paste.
Mix until the dough is just coming together, put it on a lightly floured surface and knead gently for a minute or two, to form a smooth dough. Cut in half, wrap in clingfilm and put in the fridge for 20 minutes. Put two baking trays into the oven and heat to 180C (160C fan)/gas 4.