1. Break spaghetti into thirds, cook according to directions on package; drain.
2. Rinse in cold water; set aside.
3. Combine next 9 ingredients, mixing well.
4. Stir in spaghetti.
5. Combine mayo, mustard, lemon juice, salt, sugar and pepper.
6. Stir well.
7. Pour over spaghetti mixture and toss to coat.