*Cook orzo according to package directions.

In small bowl combine vinegar, olive oil, mustard, Worcestershire sauce, garlic, dill, onion, and pepper to make dressing; mix well and set aside. Add two tablespoons of the dressing to the warm, drained, cooked orzo; mix well and cool. Add grapes, shrimp, cucumber, green pepper, salt, pepper, fresh dill, and remaining dressing and mix well. Cover and refrigerate until ready to serve.