1. Place the clams in a bowl of cool water with a few big pinches of salt and a handful of cornmeal or flour. Leave in the refrigerator for at least 3 hours or overnight so that the clams will purge themselves of sand or other foreign matter. Scrub the clams to remove exterior dirt, and place them in a bowl of very hot water for 5 to 10 minutes to facilitate opening them.

2. Meanwhile, preheat a broiler. In a mixing bowl, combine all the ingredients for the topping and mix well.

3. Working over a bowl to catch any clam juice, insert a clam knife or a small, sturdy paring knife between a clam’s shells and, with a horizontal movement, open the clam, thrusting the blade toward the muscle on the base of the shell. Detach the flesh from the shell cavity to make it easier to lift out when eating. Leave the whole clam meat in one of its shells and discard the other shell. Repeat with the other clams.

4. Spoon an equal amount of the topping atop each clam. Drizzle a little of the clam juice from the bowl over the topping, then sprinkle lightly with a little wine to keep the clams moist and prevent them from burning. Place the clams in a flameproof baking dish and place the dish 9 inches from the broiler. Broil for about 6 minutes, watching carefully to be sure the topping does not burn. If it browns too quickly, move the rack farther from the flame and add a little more clam juice or wine to the top of the clams before returning them to the oven. Serve hot with lemon wedges.