Place tofu onto a plate and place another plate on top. Set a 3- to 5-pound weight on top. Press tofu for 20 to 30 minutes; drain and discard the accumulated liquid. Chop tofu into thin squares approximately 1 1/4 by 1/2 inch. Season one side of tofu squares with salt and pepper.

Place flour in a shallow dish and place beaten egg in a separate shallow dish. Coat tofu with flour first, then with egg, and place on a third dish. Reserve leftover beaten egg.

Heat oil in a large skillet over medium heat. Fry tofu in the hot oil for 2 minutes; sprinkle scallion on top. Flip tofu, brush remaining egg on top and sprinkle with crabmeat. Heat 2 minutes more and flip again. Brush again with egg, cook 2 minutes. Flip and coat again, for a total of 2 to 3 times. Reduce heat or cook for less time if egg coating is in danger of burning.

Pour soy sauce into a bowl and serve with tofu.