Mix brown sugar, tomato paste, soy sauce, bone broth, ginger, and garlic in a small bowl. Take out 1 cup and reserve for basting and refrigerate.
Place the rest of the marinade into a large bowl with the thighs. Mix well. Refrigerate overnight.
Discard marinade from chicken and grill thighs until no longer pink (about 8 minutes per side), basting with the extra marinade as you grill. Serve warm. ENJOY!
Notes
Please note: This is an adjusted recipe. You can find the original here: https://lilluna.com/huli-huli-chicken/