Rinse the tofu and pat dry with paper towels. Cut into bite-size pieces.
In a wok or frying pan, heat enough oil to reach a depth of at least three inches.
Fry the tofu over high heat until golden and crisp. Scoop out and transfer to a strainer.
Pour off the oil leaving only about a teaspoonful.
Reheat the oil and saute the sliced onion until just starting to turn soft, about a minute.
Add the fried tofu back to the pan.
Add the sauces. Pour in about a quarter cup of water. Tip: You may mix the three sauces with water before pouring into the pan to make everything simpler.
Cook, tossing, until the tofu pieces are heated through and evenly coated with sauce.
Off the heat, drizzle in the sesame seed oil and toss the tofu a few more times.
Transfer the crispy fried tofu with chili garlic sauce to a serving bowl or individual bowls. Sprinkle with sliced scallions before serving.