With a clean towel, wrap the tofu and press with a heavy object for 15-20 minutes.
Cut the tofu into centimeter sized cubes. Lay the tofu on the slimmest side & cut into 4 slices. Lay it back down on its bigger side & cut into 7 slices. Turn it around and cut them into centimeter sized cubes.
Marinate the tofu in a bowl with the tamari, liquid smoke, salt, pepper, garlic powder and onion powder. Place in the fridge for 30 minutes. The longer it sits in the marinate, the tastier it is.
Next, cut the garlic & serrano peppers into minced size. (I use gloves)
Cut the bell peppers and onion into similar sizes like the tofu.
Fry the tofu on medium to high heat, with the sesame oil & avocado oil. Make sure the tofu is covered with oil so that it cooks thoroughly. Save marinate sauce for later. see notes for instructions to bake. Poor out the excess oil from the pan into a small bowl. Leave about 1 tbsp. left of oil on the pan to sauté the veggies.
On medium heat, in the same pan add the onions to sauté until translucent. Next add the garlic & serrano peppers, sauté for 1 minute. Add in the bell peppers and mayo, cook for 2 minutes.
Next add in the tofu, tamari, left over marinate sauce, and vinegar. IMPORTANT: WHEN VINEGAR IS ADDED, DO NOT MIX and leave it to sit for 10-15 minutes with a lid on top!
Once it is done, serve with rice and a drizzle of lime for the authentic sisig taste.