Tonkatsu Sauce is served with Tonkatsu (deep fried pork cutlet) and often used for other deep fried dishes like Ebi Fry and Korokke.
Tonkatsu Sauce mainly consists of vegetables and fruits such as tomatoes, prunes, dates, apples, lemon juice, carrots, onions, and celery. It also includes more than 10 kinds of spices along with soy sauce, vinegar, and sugar. It’s a lot of work to make it from scratch, but you can definitely make a simplified version that tastes just as good to go with your homemade tonkatsu.
To make a quick & easy Tonkatsu sauce:
- Combine ketchup, Worcestershire sauce, oyster sauce and sugar in a small bowl & whisk well.
- Taste and adjust any seasonings to your liking.
The popular Tonkatsu Sauce brand is Bulldog, which you can find in a Japanese or Asian supermarket.
(https://www.justonecookbook.com/tonkatsu-sauce-recipe/)