I tried this on pork loins and it was so good. My whole family loved it.

3/4 cup balsamic vinegar
1/4 cup olive oil
2 tsp. brown sugar
1/4 cup sweet onion, chopped

I marinaded 7 pork loins, fat removed, for about 3 hours. I then grilled the pork.

I have also tried this on chicken and it was also very good. I'm sure it would be great on beef as well.

Since their is only 2 tsp brown sugar over the whole recipe, I'm sure it wouldn't count especially since it was for 7 servings.

3/4 cup reduced-sodium chicken or vegetable broth
2 tbsp chopped fresh parsley
2 tbsp fresh lime juice
1 tbsp dried onion flakes
2 tsp canola oil
1 tsp finely grated lime zest
1/4 tsp garlic powder
1/4 tsp ground black pepper

Combine all ingredients in a medium bowl and mix well to combine. Refrigerate until ready to use.