Prepare a refreshing salmon salad using a food processor. Start by cooking salmon fillets until flaky. Let the salmon cool and then flake it using a fork. In the food processor, blend together mayonnaise, Greek yogurt, lemon juice, Dijon mustard, and fresh dill until smooth. In a mixing bowl, combine the flaked salmon, chopped celery, diced red onions, and the creamy dressing. Toss everything together until well coated. Serve the salmon salad on a bed of lettuce or in a sandwich.