Sorry for late reply
@HeatnSmoke and everyone else.
The secret recipe is actually a bottled marinade product.
But hear me out here - i have made this A LOT. And I have made this for a LOT of people.
It's always a big hit, and people ALWAYS want the recipe. It's THAT good!
The product is Mama Sita's Barbecue Marinade.
It's available on Amazon, but it's a lot cheaper if you buy locally.
You can typically find it at asian grocery stores, but some normal grocery stores carry it in their asian section.
At asian stores like 99 Ranch, H-Mart, Seafood City, you'll either find it with the soy sauces or in the filipino section.
If you have filipino stores, they'll definitely carry it.
It kicks some serious ass with chicken and beef.
Boneless skinless chicken thighs marinaded in this stuff for 12 hours, and then served with hawaiian bread and grilled pineapple is my all time favorite food.