Shrimp and Avocado Salad with Creamy Horseradish Dressing

Shrimp and avocado salad

 * 3 pounds medium-size unpeeled fresh shrimp
 * 1 (3 ounce) package shrimp-and-crab boil in bag
 * 7 green onions, sliced
 * 3 celery ribs, diced
 * 1½ cups coarsely chopped walnuts, toasted
 * 4 small California avocados, peeled and cubed
 * 9 cups mixed salad greens

Creamy horseradish dressing

 * ¾ cup mayonnaise
 * ¾ cup sour cream
 * 2 garlic cloves, pressed
 * 1 ½ tbsp chopped fresh dill
 * 2 tbsp prepared horseradish
 * 1 tbsp Dijon mustard
 * ½ tsp salt

Shrimp and avocado salad

 * 1) Cook shrimp with shrimp-and-crab boil according to package directions.
 * 2) Drain and cool.
 * 3) Peel shrimp, and devein, if desired.
 * 4) Combine shrimp, green onions, celery, and walnuts in a large bowl add creamy horseradish sauce, tossing to coat.
 * 5) Cover and chill 2 hours.
 * 6) Add avocado to shrimp mixture, and gently toss.
 * 7) Serve on salad greens.

Creamy horseradish dressing

 * 1) Stir together all ingredients.