seafood salad recipe

8 ounces imitation crab meat (flaked style or sticks cut into slices) 8 ounces raw shrimp (51-60 count) 1 lemon (quartered) ½ cup celery (finely diced) 3 tablespoons red onion (minced) ½ teaspoon Old Bay seasoning 2 teaspoons lemon juice Salt and pepper to taste ½ cup mayonnaise 1 ½ tablespoons fresh dill (chopped, plus more for garnish)