I also improvised (which I always do with recipes) and added the following:
1. dried parsley & dried basil
2. teriyaki sauce
3. thai pepper chili sauce
4. chopped scallions
6. mandarin oranges & juice
I put all liquid ingredients (with the pineapple & bbq sauce) into a food processor and pureed. Halved the liquid, some in the meatballs (adding scallions, green herbs and breadcrumbs last, to give the meatballs shape). Cooked on stove top til brown, then finished in the oven, pouring the remainder of sauce over the meatballs.
Delicious, juicy, flavorful...hot, spicy, sweet and tangy. Very tropical.