The Very Best Corned Beef Guinnessinfused Irish Comfort

Ingredients

• 1 (3-4 pound) corned beef brisket, with spice packet
• 1 tablespoon olive oil
• 1 large yellow onion, quartered
• 4 cloves garlic, smashed
• 1 (12-ounce) bottle of Guinness stout or other dark beer or beef broth
• 4 cups beef broth
• 2 bay leaves
• 1 teaspoon dried thyme
• 1 teaspoon black peppercorns
• 1 1/2 pounds Yukon Gold potatoes, peeled and quartered
• 1 pound carrots, peeled and cut into 2-inch pieces
• 1 medium head of green cabbage, cored and cut into wedges
• Fresh parsley, chopped (optional)