Corned Beef Sliders with Cabbage Slaw

Ingredients

• 3 1/2 pounds beef brisket
• 1 cup brown sugar
• 3 tablespoons kosher salt
• 3 tablespoons whole allspice berries
• 1 tablespoon whole cloves
• 1 tablespoon ground ginger
• 2 tablespoons mustard seeds
• 2 tablespoons whole peppercorns
• 1 yellow onion, quartered
• 2 cups water
• 3 12-ounce bottles of Irish beer
• 8 cups ice
• 1 medium head cabbage, cored and shredded
• 1 medium red onion, finely chopped
• 1/2 cup white sugar
• 1/2 cup apple cider vinegar
• 1 teaspoon salt
• 1 teaspoon celery seed
• 1 teaspoon white sugar
• 1 teaspoon prepared mustard
• 1/2 cup vegetable oil