In a jar with a tight-fitting lid, combine the first five ingredients; shake well. Set aside. In a skillet, cook and stir the almonds and sugar over medium heat until sugar is melted and almonds are coated, 5-7 minutes. Spread on foil to cool completely.
In a large salad bowl, combine the romaine, spinach, celery and onions. Add oranges and sugared almonds; toss gently. Shake dressing; drizzle over salad and toss to coat.