In a medium bowl, combine the apple jelly, pineapple preserves, horseradish, dry mustard, black pepper, and crushed red pepper. Using a whisk, stir vigorously until the mixture is completely smooth and well blended, ensuring the flavors meld together for the perfect balance of sweetness and heat.
1 5-ounce jar apple jelly, 1 5-ounce jar pineapple preserves, 1/3 cup prepared horseradish, 1 1/2 teaspoons dry mustard, 1/2 teaspoon black pepper, 1/4 teaspoon crushed red pepper