2 cups flour
1 tbsp baking powder
2 tbsp lavender sugar (recipe follows), or more to taste (if your berries are very tart, for instance)
1/2 tsp salt
12 tablespoons unsalted butter, frozen
1/2 cup crème fraîche
1/2 tsp vanilla
2 eggs
1 1/2 cups mixed berries (I used strawberries, blueberries, and raspberries)
1 tablespoon chopped lavender (see headnote)
heavy cream for brushing
1-2 tablespoons lavender sugar for sprinkling