Boil the Pasta: Bring a large pot of salted water to a rolling boil. Cook the medium shells pasta for 7-8 minutes, or until al dente. Drain and rinse under cold water.

Mix Ingredients: In a large mixing bowl, combine the cooled pasta, imitation crab meat, thawed peas, chopped red onion, diced celery, and diced red bell pepper. Stir in the mayonnaise and fresh dill.

Season & Chill: Add salt and pepper, mixing gently. Cover with plastic wrap and refrigerate for at least 1 hour.

Serve: Stir, adjust seasoning if needed, and serve in a chilled bowl. Garnish with fresh chives and optional lemon juice.