Can be prepared in 45 minutes or less.

Ingredients

　　1 1/2 tablespoons red-wine vinegar

　　1 tablespoon Dijon-style mustard

　　1/4 cup olive oil

　　2 tablespoons finely chopped red onion

　　1 tablespoon finely chopped fresh parsley leaves

　　3/4 pound sirloin steak, about 1 inch thick

　　1 garlic clove, halved

　　Boston lettuce, shredded, for lining the plates

　　1 navel orange, peeled, the zest and pith cut away with a serrated knife and the sections cut away from the membranes

　　In a bowl whisk together the vinegar, the mustard, and salt and pepper to taste, add the oil in a stream, whisking, and whisk the dressing until it is emulsified. Stir in the onion and the parsley. Rub the steak with the garlic, discard the garlic, and sprinkle the steak with salt and pepper to taste. Broil the steak on the rack of a broiler pan under a preheated broiler about 4 inches from the heat for 4 to 5 minutes on each side for medium-rare meat and let it stand for 5 minutes. Divide the lettuce between 2 plates, arrange decoratively on the top the steak, sliced thin diagonally, and the orange sections, and drizzle some of the dressing over each salad. Serve the remaining dressing separately.