Grilled Steak and Onions with Rosemary-Balsamic Butter Sauce

Ingredients

• 2 pounds sweet onions, large shallots, baby leeks, and green onions
• 1 large shallot
• 8 tablespoons unsalted butter
• 2 tablespoons orange juice
• 4 1 1/4-inch-thick New York strip steaks (each about 6 ounces)
• 2 tablespoons olive oil
• 2 large fresh rosemary sprigs
• + 1 more ingredients
• • ½ cup balsamic vinegar

Melt 6 tablespoons butter in heavy small saucepan over medium heat. Add minced shallot and cook until translucent, about 2 minutes. Add vinegar and rosemary and simmer until syrupy and reduced to 1/2 cup, about 6 minutes. Remove from heat (balsamic sauce will separate as it stands). Prepare barbe...

View full recipe at Epicurious