In a large bowl, sift together the flour, baking powder and salt. Cut the butter into small pieces. With a fork or pastry cutter, cut the chilled butter until the mixture resembles coarse crumbs. Add ½ cup of the sugar and blend. Slowly incorporate the half-and-half with a fork. Spoon the dough over the fruit mixture in the pie dish. Mix 2 tablespoons sugar and the remaining zest, and sprinkle it over the top. Bake for 25 to 30 minutes, or until golden brown. Cool slightly and serve with or without whipped cream.