Grilled Steak and Onion Salad

1/2 cup olive oil 6 tablespoons white balsamic vinegar 1 3/4 teaspoons dry mustard, divided 1 tablespoon dark brown sugar 1 2-pound well-trimmed tri-tip beef[...]

2 lbs flank steaks, about 1 1/2-inch thick, trimmed 2 tablespoons brown sugar , divided 2 garlic cloves , minced 1 teaspoon coarse salt 2 tablespoons olive[...]