Cut pork and vegetables into bite-sized pieces.
Slice the tofu into pieces that are easy to eat.
In a bowl, mix gochujang, soy sauce, minced garlic, sugar, sesame oil, and pepper to make the sauce.
Marinate the pork with half the sauce for 10 minutes.
Heat oil in a pan and sauté the onion and green onion.
Add the pork and stir-fry over high heat.
When the pork is cooked, add the remaining sauce and stir-fry a bit more.
Add the tofu on top, cover with a lid, and let it steam for 2 minutes.
Serve the pork and tofu over rice to complete the dish.