Makes 4 servings

Ingredients:

1 (12-ounce) bottle pale beer
1 cup fish stock
1/2 cup diced peeled carrot
1/2 cup chopped celery
2 bay leaves
1 teaspoon whole black peppercorns
1/2 teaspoon salt
1/4 teaspoon ground black pepper
4 (6-ounce) halibut steaks
1/2 cup minced peeled red onion
6 tablespoons unsalted butter