Seafood Salad Sandwich

1 pkg. vegetable soup mix, more or less to taste 1 tsp. paprika ½ tsp. Old Bay, more or less to taste 1 tsp. ground pepper 1 cup sour cream ½ cup mayonnaise ¼ cup diced onion or scallions 1 tsp. lemon juice ½ cup salsa 12-24oz crab meat, to taste 12oz small ready to eat shrimp Croissants or other bread of choice Sandwich toppings as desired, such as lettuce, extra onion, tomato, etc.