Citrus Mango Salad

Toss lettuce, oranges, celery, cucumber, mango and onions in a large serving bowl. Combine remaining ingredients in a small jar or other small container with a tight lid and shake until well combined. Taste the dressing; you might need to add a little more orange juice if you want it thinner or less for a thicker dressing. If you like your dressing sweet, you might want to add more sugar. If you use low-fat sour cream, use only a drop of mustard, as it will over-power the dressing. Pour the dressing over the salad, toss and serve. Enjoy!