Heat the sesame oil in a large skillet over medium heat. Add the chops and brown them lightly on both sides. Transfer the chops to paper towels to drain.
Add the onion and garlic and cook, covered, over low heat until tender and lightly colored, 20 minutes.
Add the soy sauce, chili paste, marmalade, vinegar, and ginger. Simmer for 2 minutes, stirring