Slice the shishito peppers and onion into bite-sized pieces.
Cut the pork neck into bite-sized pieces.
Heat oil in a pan and stir-fry the pork neck.
When the pork is halfway cooked, add the onion and shishito peppers and stir-fry together.
Season with soy sauce, sugar, and minced garlic.
Serve the stir-fried ingredients over rice to finish.