Combine flour, sugar, and salt in a bowl.
Cut in the cold butter until mixture is crumbly.
Add ice water and bring the dough together.
Chill dough for 20 minutes.
Roll out and press into a tart pan.
Preheat oven to 375°F.
Mix berries, sugar, cornstarch, lemon, cinnamon, and nutmeg in a saucepan.
Cook until thickened.
Pour filling into the tart crust.
Bake for 25–30 minutes or until golden.
Cool fully before slicing.