my first thought was ketchup, so how about ketchup, minced garlic, and minced onion?
or along the lines of what unka bob suggested, how about a sesame seed/teryaki sauce. again, whatch out for too much salt between the cheese and soy. maybe you could make some without cheese, and add some green onion? sort of a beef negimaki egg roll.
The way that you wander is the way that you choose. The day that you tarry is the day that you lose.
Sunshine or thunder, a man will always wonder where the fair wind blows.