For blue cheese dip:
�1/2 cup sour cream
�1/4 cup finely chopped scallions
�2 tablespoons finely chopped flat-leaf parsley
�1/2 cup crumbled blue cheese (2 ounces)
�2 teaspoons fresh lemon juice
�1 1/2 teaspoon milk
For shrimp:
�18 jumbo shrimp (1 1/2 to 2 pounds), peeled, leaving last shell segment and tail fan attached, then deveined
�2 tablespoons olive oil
�1/2 stick unsalted butter, melted
�1/4 cup hot sauce such as Frank's RedHot
�1/2 bunch celery, cut into 4-inch sticks
Make dip:
Stir together ingredients, 1/8 teaspoon salt, and 1/4 teaspoon pepper.
Make shrimp:
Prepare grill for direct-heat cooking over medium-hot charcoal (medium heat for gas); see Grilling Procedure . Toss shrimp with oil and 1/2 teaspoon each of salt and pepper. Oil grill rack, then grill shrimp, covered only if using a gas grill, turning once, until just cooked through, 7 to 8 minutes total. Stir together butter and hot sauce in a large bowl. Add shrimp and toss until coated. Serve shrimp with dip and celery.