Slice tofu into 1/4" thick slices, about 1" in length.
Blot tofu dry using paper towels and sprinkle salt on each side of each tofu slice. The salt helps the tofu to brown.
Meanwhile, heat up the oil in a (preferably non-stick) pan.
Pan fry the tofu first on high heat until it browns on both sides. Don't worry if it fails to brown since this tofu will be covered in sauce later.
Bring down the flame and then combine soy sauce, sugar, ginger, and water into the pan with the tofu. Make sure you bring down the flame or else the soy sauce will burn! Let the liquid reduce to as little as you'd like it to be. Done!