Cook pasta according to package directions.
Drain and rinse well with cold water. Toss with olive oil and set aside.
Stir the sour cream, mayonnaise, lemon juice, lemon zest, dill, cayenne, and salt and pepper until smooth. Fold in the onion, peas, ham and cheese.
Add past and toss.
Garnish with fresh dill if desired.
Serve chilled