Spicy Guinness Mustard

Ingredients

• 1 (12-oz.) bottle Guinness Extra Stout
• 1 1⁄2 cups brown mustard seeds (10 oz.)
• 1 cup red wine vinegar
• 1 tbsp. kosher salt
• 1 tsp. freshly ground black pepper
• 1⁄4 tsp. ground cinnamon
• 1⁄4 tsp. ground cloves
• 1⁄4 tsp. ground nutmeg
• 1⁄4 tsp. ground allspice