Maple-Glazed Corned Beef With Orange And Stout

Ingredients

• 1 flat cut, corned beef brisket, about 3 pounds
• 2 medium-size sweet onions, cut into 8 wedges
• 2 ribs celery, roughly chopped
• 1 medium-size orange, ends trimmed, halved, thinly sliced
• 3 large cloves garlic, sliced
• 1 teaspoon black peppercorns
• 1/2 teaspoon whole cloves
• 2 bay leaves
• 1 cup stout beer
• 8 long skinny carrots, 12 ounces total, peeled, cut crosswise in half
• 1/4 cup pure maple syrup
• 1 tablespoon molasses, optional
• 1 tablespoon dijon mustard
• 1/2 teaspoon freshly ground black pepper
• horseradish sauce, for serving