Quick and Easy Tonkatsu Sauce

• 3 tablespoons apple cider vinegar
• 1 tablespoon soy sauce
• 1/2 tablespoon brown sugar
• 1 teaspoon yellow mustard
• 1/8 teaspoon onion powder
• 1/8 teaspoon garlic powder
• 1/8 teaspoon ground ginger
• Pinch of salt
• Pinch of allspice

Mix all the ingredients in a bowl and transfer the sauce to a bottle. Leave it in the fridge until you are ready to use it.