Flank Steak without almonds goat mayonnaise

2 garlic cloves 1 tablespoon fresh thyme or 2 teaspoons dried thyme 4 tablespoons soy sauce 2 tablespoons olive oil salt & pepper 1 1/2 lbs flank steaks 1 1.[...]

2/3 cup balsamic vinegar 1 tablespoon olive oil 6 cups vertically sliced onion (about 1 1/2 pounds) 1/2 teaspoon salt, divided 1 (1-pound) flank steak,[...]