Tarte mures

The butter needs to be soft. This is can be done by taking it out of the fridge a few hours before cooking or by microwaving it a few seconds in unfreeze mode.

Mix the caster sugar with the butter and the lime zest.
Then mix the flours together and add a pinch of salt.
Incorporate the butter with the flour then add the egg and form a dough.
Place it 2 hours in the fridge.

In a pot cook 200g of blackberries with the sugar for 15 minutes (more or less). Then put aside and let it cool completely.

Flatten the dough and lay it on a tart dish.
Pour the jam on the it and garnish with the rest of the blackberries.
Preheat the oven at 180.
Cook for 25 minutes.