Rinse meat and pat dry. In a 6-quart stockpot, heat olive oil and brown beef over medium heat for 2 minutes, stirring. Add cabbage, tomatoes and tomato sauce, water, lemon juice, vinegar, both sugars, onion powder and salt. Bring to boil. Skim off any foam and discard. Reduce to a simmer, cover and cook for at least 2 hours. Longer is fine; you really want the flavors to mellow. Ladle into bowls and serve.