1/2 cup unsalted butter (softened, plus extra for greasing the pan)
1 cup Sugar
1 large egg
1 teaspoon pure vanilla extract
  grated zest of 1 lemon
1/4 teaspoon ground nutmeg
1 1/2 cups unbleached all-purpose flour
1 1/2 teaspoons baking powder
1/2 teaspoon salt
1/2 cup whole milk or buttermilk
1 pint fresh Earthbound Farm Organic Blueberries (picked over)
2 tablespoons Sugar
1/4 teaspoon ground allspice