In a well heated skillet/wok, add some cooking oil. Add the marinated meat and cook it on medium high heat until about 70% of the meat is cooked (3 to 5 mins). Add the kimchi and sugar and stir them well until the kimchi is fully cooked and tender (3 to 5 mins). Add the sesame oil, sesame seeds, and green onion and stir quickly. Remove from the heat.
(Ideally, this step should start at the same time as step 1). Boil some water in a pot (enough to cover the tofu) and once the water is rolling boiling, add the tofu and cook it for 2 to 3 mins. Drain the water and thinly slice the tofu ( about 5 cm x 5 cm /2 inch x 2 inch). Watch out for hot steam or hot tofu while slicing. Tip: If you have a clean linen cloth (e.g. cheese cloth), wrap up the tofu with it before boiling. Then it’s easy to take it out while keeping the tofu shape in place.
Serve the tofu and stir fried kimchi with pork on a large plate. Enjoy while still warm.