Classic Shrimp Cocktail Platter with Zesty Dipping Sauces

Ingredients

• 1 pound (450 g) large shrimp, peeled and deveined (U.S. #16-20 size)
• 1 tablespoon (15 mL) Old Bay seasoning
• 1 lemon, halved
• 4 cups (960 mL) water
• 1/2 cup (120 mL) ice
• 1 cup (240 mL) ketchup
• 2 tablespoons (30 mL) horseradish sauce
• 1 tablespoon (15 mL) Worcestershire sauce
• 1 teaspoon (5 mL) lemon juice
• Dash of hot sauce (to taste)
• 1 ripe avocado
• 1/4 cup (60 mL) sour cream
• 1 tablespoon (15 mL) lime juice
• Salt and pepper to taste