Mix the salad dressing at the bottom of a salad bowl. Bring a pot of salted water to a boil. If your shrimp are raw, pop them into the water for 1-2 minutes until they turn pink. Quickly remove with a slotted spoon. Add the orzo to the boiling water and cook like pasta for about 10-12 minutes, tasting to make sure it is done. Drain the orzo and run under cold water in a sieve to cool it down. Add the cooked shrimp, orzo, red bell pepper, scallion and chopped dill to the bowl and mix well. Serve orzo and shrimp salad on the plate or on a lettuce leaf if you want to dress it up.