Ingredients:

  • 1/2 cup Ketchup (High quality)
  • 1/4 cup Worcestershire Sauce (Dark, strong flavour)
  • 2 Tbsp Soy Sauce (Light/All-purpose)
  • 2 Tbsp Packed Light Brown Sugar
  • 1 Tbsp Honey or Maple Syrup
  • 1 Tbsp Apple Cider Vinegar (5% acidity)
  • 1 tsp Fresh Ginger (Finely grated)
  • 1/2 tsp Garlic (Finely minced)
  • 1/2 tsp Dijon Mustard
  • 1/4 cup Water or Vegetable Stock

Instructions:

  1. Prepare Aromatics: Finely grate the fresh ginger and mince the garlic using a microplane or fine grater. Set aside.
  2. Combine Wet Ingredients: In a small saucepan, combine the ketchup, Worcestershire sauce, soy sauce, brown sugar, honey (or maple syrup), and apple cider vinegar. Whisk briefly.
  3. Add Aromatics: Stir in the grated ginger, minced garlic, and Dijon mustard.
  4. Thin the Mixture: Pour in the 1/4 cup (60 ml) of water or vegetable stock. Whisk until the sugar begins to dissolve and the mixture is uniform.
  5. Bring to a Boil: Place the saucepan over medium heat. Bring the mixture to a low, rolling boil, stirring constantly to prevent the sugars from scorching on the bottom.
  6. Reduce Heat and Simmer: Immediately reduce the heat to low, maintaining a gentle simmer.
  7. Thicken: Simmer uncovered for 8 to 10 minutes. The mixture should reduce slightly and darken in colour. Stop cooking when the sauce is still slightly thinner than desired, as it thickens significantly as it cools. Taste and adjust sweetness or tang if necessary.
  8. Cool Down: Remove the saucepan from the heat. Pour the Tonkatsu sauce into a clean, heatproof bowl or jar.
  9. Chill: Allow the sauce to cool completely to room temperature before covering and refrigerating. This cooling time is crucial for achieving the classic thick, viscous texture.
  10. Serve or Store: Use immediately, or refrigerate in an airtight container for up to 2 weeks.