Combine the apple, onion, vinegar, pepper, garlic, mustard, cinnamon, ginger and about 2 pinches of salt in a medium saucepan over medium heat. Bring to a boil and then reduce to low.
1 large apple chopped, 1 small onion chopped, ⅛ cup apple cider vinegar, 1 small red pepper or half a large chopped, 1 cloves garlic, squirt of brown mustard, ½ teaspoon cinnamon, 1 teaspoon ground ginger, Kosher Salt