Use firm tofu.
Wrap in several layers of paper towel.
Weigh down with another plate plus something no more than 3 lbs for 20 minutes. I use my favorite cookbook, The Joy Of Cooking.
Cut tofu brick in half horizontally.
Flip the cut side up and cut those horizontally.
Cut these pieces into six.
You should have 24 pieces when finished. Take another piece of paper towel and dab any extra moisture.
In a large skillet over medium high heat, add 3 tbsp of cooking oil. Add the tofu. Cook for 4-5 minutes a side, until brown and crispy. Drain on paper towels and set aside.
In the same skillet, drain the oil and wipe clean. Over medium heat, add the chili oil, dried Thai chilis, and garlic. Cook for 1 minute.
Mix together the soy sauce, apple cider vinegar, brown sugar, sambal, chicken stock, and cornstarch. Add them to the skillet, reducing the heat to medium low. Cook for 2 minutes.
Add in the fried tofu.
Cook for 1 more minute, making sure that the tofu is evenly coated with the sauce.
Serve with steamed rice. Sprinkle with toasted sesame seeds.