Bloody Mary Shrimp

INGREDIENTS

• 1/4 cup fresh lemon juice
• Garnish: diced avocado (optional)
• 1 1/2 cups thinly sliced celery (3 to 4 ribs)
• 1/4 cup vodka (preferably Absolut Peppar)
• 1 pound medium shrimp in shell, peeled and deveined
• 1 teaspoon Tabasco
• 1/2 cup ketchup
• 1 cup thinly sliced scallions (about 6)
• 1 teaspoon Worcestershire sauce
• 2 tablespoons bottled horseradish (not drained), or to taste