Porcini and Artichoke Stuffing (for Grilled Stuffed Pork Tenderloin)

Microwave ½ cup water and porcini in covered bowl until steaming, about 1 minute. Let stand until softened, about 5 minutes. Use fork to remove porcini from liquid and pat dry with paper towels. Discard soaking liquid. Pulse porcini, artichokes, Parmesan, tomatoes, parsley, pine nuts, garlic, lemon zest, and lemon juice in food processor until coarsely chopped, 5 to 10 pulses; season with salt and pepper to taste.