Rinse frozen peas under cold water. Strain, and place in a large mixing bowl. Add eggs, rice, celery, onions, and pimiento; toss to combine, and set aside. In a separate bowl, stir the mayonnaise together with mustard, lemon juice, relish, tuna, dill, salt, and pepper until well blended. Add to the vegetable mixture, and toss to combine. Cover, and refrigerate for a minimum of 4 hours. Toss once more before serving. Serve chilled.