Meet Manhattan clam chowder, the lesser-known (though equally delicious) cousin to New England's most famous soup recipe. Total TimePrep: 10 min. Cook: 40 min. Makes 8 servings (about 2 quarts) Ingredients 2 tablespoons butter1 cup chopped onion2/3 cup chopped celery2 teaspoons minced green pepper1 garlic clove, minced2 cups hot water1 cup cubed peeled potatoes1 can (28 ounces) diced tomatoes, undrained2 cans (6-1/2 ounces each) minced clams, undrained1 teaspoon salt1/2 teaspoon dried thyme1/4 t