1. Lightly coat a wok or large saucepan with oil and place over medium-high heat. Add onion and crumble in beef. Using a fork, stir frequently to keep meat crumbly until it;s almost cooked through, 3 to 4 minutes. Add the tomatoes, tomato sauce, brown sugar, vinegar and seasonings. Stir often until flavor develops, about 5 minutes.

2. Meanwhile, slice green pepper into thin strips. If using a cabbage, thinly slice. Add pepper, cabbage or coleslaw mix to pan and stir often, uncovered, until cabbage is tender, 4 to 5 minutes. Taste and add salt if needed.