Flank Steak With Grilled Mixed Onions

• 3 tablespoons unpacked brown sugar
• 1 12 tablespoons balsamic vinegar
• 3 medium yellow onions, cut in 1/2-inch-thick slices
• 1 large vidalia onion, cut in 1/2-inch-thick slices
• 2 medium red onions, cut in 1/2-inch-thick slices
• 1 teaspoon table salt
• 14 teaspoon black pepper
• 1 14 lbs flank steaks

1. Heat grill or grill pan to medium.
2. Combine sugar and vinegar in a small bowl.
3. Brush onions with vinegar mixture and sprinkle with 1/2 teaspoon of salt.
4. Grill onions until soft and caramelized, turning occasionally, about 45 minutes.
5. (Skewer onions or place them in a grill basket or on foil with slits to prevent them from falling through the grill rack.
6. ).
7. Sprinkle steak with remaining 1/2 teaspoon of salt and 1/4 teaspoon of pepper.
8. Place on grill when onions have been cooking for 30 minutes.
9. Cook 8 minutes on each side, or until medium rare.
10. Let rest 10 minutes and slice thinly against the grain.

brown sugar, balsamic vinegar, yellow onions, vidalia onion, red onions, salt, black pepper, flank steaks

Taken from www.food.com/recipe/flank-steak-with-grilled-mixed-onions-335915 (may not work)