One of the best pie fillings is fresh summer fruit. Our summer peach pie gets a comforting warmth from bourbon, cinnamon, and nutmeg. The sweetness is our plum pie is intensified by grape jelly. Some fruits are delicious in pie, but produce fillings that are too loose. To get around this, our black and blue berry pie and concord grape pie use tapioca, which thickens the filling without adding any off flavors or making it gummy.