2 medium carrots, quartered
2 stalks celery, quartered
1 head garlic, halved
1 lemon, halved
1 large onion, quartered
1/2 bunch parsley
5 sprigs fresh thyme
2 bay leaves
1 pound medium or large shrimp, in the shell, rinsed
1 cup ketchup
4 teaspoons prepared and drained horseradish
1/4 teaspoon Worcestershire sauce
1 lemon, zest finely grated and juiced
Hot sauce, optional
Lemon wedges, for serving