Double-Crust Lattice Blueberry Pie

Using frozen berries in pies produces erratic results. Often, they weep too much as they cook, even if they are thawed and drained before using in a pie filling. The flavor with frozen berries is good, but the pie doesn’t slice cleanly and the filling is too runny. To get the firmer texture and ease of slicing I prefer, I cook the filling prior to putting it in the oven. This recipe is a bit of a hybrid—calling for less expensive frozen berries in the cooked portion of the filling but stirr