Cut tofu into rectangles, 1.5 X 0.75 X 2 cm. Pat dry. Heat oil in a wok over a medium high heat. When hot, put in half the tofu. Cook 3 minutes on one side. Turn over & cook for another 3 minutes. Remove with a slotted spoon. Keep on a warmed platter. Repeat with the rest of the tofu. Serve hot with a sauce.