Make the Pastry: In a bowl, rub together flour, icing sugar, butter, and salt until it looks like breadcrumbs. Add 1-2 tsp cold water and bring it into a dough. Chill for 15 minutes.
Blind Bake the Crust: Preheat oven to 200°C (400°F). Roll out dough and line a 9-inch tart tin. Prick with a fork and blind bake for 15 minutes.
Prepare the Filling: In a saucepan, warm the golden syrup until slightly runny. Stir in lemon zest, juice, and breadcrumbs. Let sit for 10 minutes (add more breadcrumbs if too thin).
Assemble & Bake: Pour filling into the baked crust. If you have extra dough, cut strips for a lattice top. Lower oven to 180°C (350°F) and bake for 15-20 minutes until golden.
Serve & Enjoy! Best served warm with vegan cream or ice cream!