INGREDIENTS
3 cups
flour (I used half white, half wheat pastry)
1 tbsp
baking powder
1/3 cup
sugar
1/2 tsp
salt
1 stick
chilled unsalted butter, cut into small cubes
Juice and zest of 1 lemon
3/4
to 1 1/2 cups buttermilk
6 oz
fresh blackberries
1
large egg
2 tsp
water
2 tbsp
coarse sugar (optional)