Blanch the tofu in boiling water briefly to remove impurities.

Let the tofu cool slightly, then cut it into cubes and pat dry with a kitchen towel.

Mix ketchup, soy sauce, sugar, and minced garlic to make the sauce.

Place flour in a bag, add the tofu cubes, and shake to coat evenly.

Heat oil in a pan and pan-fry the tofu cubes until golden and crispy.

Simmer the prepared sauce over low heat until slightly thickened.

Add the fried tofu to the sauce and toss to coat evenly.