Instructions: Bring water to a boil. Add shrimp; return to a boil.

Lover heat, and simmer 3 to 5 minutes. Drain shrimp well; rinse with cold water. Chill. Peel and devein shrimp; set aside.

Cut pineapple in half lengthwise. Scoop out pulp, leaving shells 1/2 to 1/4 inch thick. Cut pineapple pulp into bite-size pieces, discarding core. Set aside 1 cup pineapple pieces; reserve remaining pieces for use in other recipes.

Peel, seed, and seciton orange and grapefruit; combine fruit sections with 1 cup pineapple pieces and shrimp.

Cover; chill until ready to serve.

Before serving, peel and dice avocado; sprinkle with lime juice to prevent discoloration. Combine avocado and shrimp mixture; spoon into reserved pineapple shells. Pour dressing over top before serving.

Dressing: Combine all ingredients in container of electric blender; blend well. Serve immediately.

Yield: 3/4 cup.

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