In a small bowl, WHISK together the six dressing ingredients; SET aside.
In a large bowl, COMBINE romaine and onion slices.
DRIZZLE greens with dressing; TOSS to coat; TOP with oranges.
Per Serving (excluding unknown items): 149 Calories; 5g Fat (28.6% calories from fat); 5g Protein; 25g Carbohydrate; 8g Dietary Fiber; 0mg Cholesterol; 65mg Sodium. Exchanges: 1 1/2 Vegetable; 1 Fruit; 1 Fat; 0 Other Carbohydrates.