Place romaine lettuce and spinach in a large salad bowl. Add crumbled bacon, onion, mandarin orange sections and mushrooms. Mix and toss the ingredients. Add enough dressing to coat the leaves, tossing with the salad. Serve at once. Yield: 4 servings. Mardi Gras Dressing: Put onion, vinegar, sugar, mustard and salt in an electric blender. While blending on low speed, gradually add the olive oil. May be made ahead of time. Before using, blend the dressing. Yield: ½ cup. |