Cut Romaine lettuce into bite size pieces. Arrange on individual plates or a large platter.
Cut celery into small pieces and add to the salad.
Slice bell peppers into bit size pieces and sprinkle on lettuce.
Slice the tomatoes and then cut into small chunks and place on top of the celery.
Cut the shrimp in quarters or you can place the whole shrimp on the salad if you like that look.
Slice the red onion into small pieces and sprinkle on top of the shrimp.
Cut the avocado into chunks and top off the salad.
Put 1 Cup of balsamic vinaigrette into a bowl and add mayonnaise. Mix together with a fork and pour on top of salad to dress.
Sprinkle on both the Mrs. Dash and onion salt.