Ever since I was a kid, Bronco Billy (a steakhouse chain in central Japan) has been a favorite of mine. When I was younger, the steak was a rare and luxurious treat, and I always looked forward to my few visits. My fondness for Bronco Billy hasn’t faded; it’s only grown stronger over time. That’s why I used Bronco’s sauce as my inspiration for creating this delicious Japanese steak sauce recipe!