For each person put 12 cherrystone clams on a large square of heavy duty aluminum foil. In a small bowl put enough salt to equal about 1/4 teaspoon per person, a generous amount of freshly ground pepper, and a small piece of garlic per person. Put through a press. Add a good lump of butter. Divide mixture among foil bundles. Bring the foil up over the clams and twist to make a tight bundle. Put on a medium-hot charcoal fire and cook for 8 to 10 minutes, shaking the package once or twice. Open a package to test. The clams should be removed from the fire the minute they are opened. Serve each person a clam bundle with hot French bread to dunk in the tasty sauce.