In A Bowl, Beat Eggs, Onion, Parsley, Tarragon, Salt And Pepper. Melt Butter In A Skillet Over Medium Heat; Add Egg Mixture. As Eggs Set, Lift Edges, Letting Uncooked Portion Flow Underneath. Sprinkle With Chicken And Celery Seed. When The Eggs Are Set, Remove From The Heat; Fold Omelet In Half.