For fresh cherries, use a cherry pitter to remove the pits. If you are using sweet cherries, you may want to cut them in half since they are considerably larger than tart cherries. For frozen berries, do not thaw prior to making the filling. Preheat the oven to 400°F.
In a medium sauce pan, dissolve the cornstarch in the cold water. Add the cherries, sugar, lemon juice, lemon zest, and cinnamon. Mix well to incorporate all of the ingredients.
Cook the cherry mixture over medium-low heat until thickened, about 5 to 7 minutes. Transfer the cooked berries to (6) 7-oz ramekins (for mini cobblers, pictured above) or an 8 inch square baking dish or 1½ quart oval baking dish (for regular cobbler). Set aside.
In a medium mixing bowl, combine the flours, sugar, baking powder, and salt. Mix with a fork to combine. Cut in 4 tablespoons of chilled and cubed butter with a pastry cutter. Work the butter in until the dough resembles small pebbles or wet sand. Stir in the boiling water and mix to incorporate.
Transfer the biscuit dough to a sheet of parchment paper. Divide the dough into six roughly equal pieces and flatten with your palm to form round biscuits about ½ inch thick. The dough will be slightly sticky, so you may need to refrigerate it a few minutes before forming. For the stars and stripes (pictured in blog) use a cookie cutter or sharp knife to cut out stars and to cut thin strips of dough.
Evenly place the biscuits on top of the berry mixture. The biscuits should cover the majority of the berries in both the ramekins and the full size baking dish.
For mini cobblers, bake 18 to 22 minutes, or until the berries are bubbling and the biscuits are lightly golden brown. For regular cobbler, bake 20 to 25 minutes, or until the berries are bubbling and the biscuits are lightly golden brown. Note that depending on your oven, this cobbler could take longer to bake. Use the browning and bubbling as an indicator that the cobbler is done. Remove from heat and allow to cool for 20 minutes to let the filling thicken. Serve with vanilla ice cream or whipped cream!