Bourbon, Stout and Sweet Potato Waffles with Ham and Maple Sauce

Ingredients

• 1 1/2 cups all-purpose flour
• 1 tablespoon baking powder
• 1/2 teaspoon salt
• Pinch each freshly grated nutmeg, ground
• cardamom and ground ginger
• 3 large eggs, separated
• 1/2 cup whole milk
• 1/2 cup Guinness or other stout or dark beer
• 2 tablespoons bourbon
• 1 cup cooked and mashed sweet potatoes
• 2 tablespoons butter, melted
• 2 tablespoons butter
• 2 cups 1⁄2 -inch-diced leftover ham
• 1/3 cup chopped onion
• 1 cup heavy cream
• 1 cup Ham Stock
• 1 cup real maple syrup
• 2 tablespoons Dijon mustard
• Salt and freshly ground black pepper
• Chopped fresh chives, as garnish
• 1 meaty ham bone or 2–3 ham hocks (about 2 pounds total)
• 1 onion, unpeeled, studded with 2 cloves
• 3 garlic cloves, unpeeled
• 1 carrot, peeled and cut into 3 pieces
• 2 celery stalks, each broken into 3 or 4 pieces
• 1 fresh thyme sprig
• 3 bay leaves
• 1 teaspoon black peppercorns