How to Make It
Process koji rice in a high-speed blender until powdery, about 1 minute. Add cola, soy sauce, brown sugar, apple cider vinegar, garlic, shallot, and peppercorns. Process until mostly smooth, about 30 seconds.
If desired, remove 1/4 cup marinade for basting; cover and refrigerate until ready to use. Separate meat into separate ziplock plastic bags by type; divide marinade evenly among bags. Seal bags; turn to coat meat. Marinate salmon up to 1 hour; marinate all other meats 1 to 24 hours as desired.
Remove meat from marinade, allowing excess to drip off. Discard marinade. Season meat all over with salt. Let stand at room temperature while preparing grill, about 30 minutes. Grill meat on oiled grill grates over direct heat, uncovered, for times specified in Note below. Baste chicken halfway through cook time; baste all other meats during last 5 minutes. Let rest 10 minutes before serving.
Salmon fillets: 4 to 5 minutes, skin side down; 3 to 4 minutes, skin side up
Lamb rib chops: 12 to 16 minutes
Pork loin chops: 12 to 16 minutes
Skirt steak: 14 to 18 minutes
Chicken wings: 25 to 30 minutes