Preheat oven to 180°C (350°F). Grease two baking trays.

Mix flour, baking powder, salt, and sugar in a bowl.

Rub in butter until mixture resembles breadcrumbs.

Beat eggs, then mix with buttermilk and vanilla.

Combine wet and dry ingredients to form a dough.

Press dough into trays and smooth the top.

Bake for 1 hr 00until golden.

Cool, then cut into fingers.

Dry rusks in a low oven (100°C/210°F) for 2 hours until crisp.