Cut okra into 1/2-inch-thick slices. Peel and chop tomato. Cut onion into thin slices and cut corn from cob. In a heavy skillet heat 1 tablespoon oil over moderately high heat until hot but not smoking and saut? okra with salt to taste, stirring occasionally, until browned, about 3 minutes. With a slotted spoon transfer okra to a bowl. Add remaining tablespoon oil to skillet and saute onion, stirring, until it begins to soften. Stir in tomato, water, and Worcestershire sauce and simmer, stirring occasionally, 3 minutes. Add corn and simmer until corn is crisp-tender and sauce is thickened, about 3 minutes. Stir in okra with salt and pepper to taste and cook until heated through.