Tonkatsu sauce is a tasty condiment that goes well with Japanese pork cutlets. This easy recipe uses simple ingredients and can be customized to your liking.
To prepare the toasted sesame seeds, place them in a suribachi or mortar and pestle and coarsely grind them (if you prefer a finer texture, you can crush them further). Set aside.
To make tonkatsu sauce, combine the ketchup, Worcestershire sauce, soy sauce, dry mustard (or Dijon mustard) and onion powder in a small mixing bowl. Mix well until all the ingredients are fully incorporated.
Just before serving, add the crushed sesame seeds to the sauce and mix well. Drizzle the sauce over your tonkatsu or other fried foods and enjoy!Note: Homemade tonkatsu sauce can last in the refrigerator for up to 1 month if kept in an airtight container. (I recommend mixing in the crushed sesame seeds just before serving for maximum freshness and flavor.)