Blackberry Crumble - cooking recipe

Ingredients

3 cups flour
1/4 tsp cinnamon
1 3/4 cups sugar
1 tsp vanilla extract
19 tbsp butter
None pinch salt
1/4 cup blackberry jam
2/3 lb blackberries

Preparation

For the pastry dough, mix the flour, cinnamon, sugar, vanilla, butter and a pinch of salt in a bowl and rub the butter in with your fingers until crumbly.
Preheat the oven to 325\u00b0F. Grease and flour a 4 x 13 inch pan and press 2/3 of the dough into the bottom and sides to make a pastry base. Refrigerate.
For the blackberry mixture, heat the jam in a saucepan over low heat then remove and cool for 5 mins. Mix in the blackberries then set aside.
Lay a sheet of parchment paper over the chilled pastry base and fill it with dried beans. Bake for 10-15 mins then remove the beans and paper. Fill with the blackberry mixture, top with remaining dough crumbs then bake for 35 mins. Cool on a wire rack for at least 6 hours.