An experiment gone well! Tried it out and Erin loves it.
Used originally for hamburgers, but may be useful for other things.
Mix all the ingredients together, and add salt and pepper to taste.
Add more pineapple juice, if desired.
I think you can add as much juice as you want, depending on how strong you
would like the sauce to be, because the juice isn't an overwhelming flavor itself, adding more just serves to make the sauce weaker.