Add all ingredients to a blender or food processor. Blend on high until completely smooth, about 30-45 seconds, until it forms a thick, deep red paste.
Coat the Chicken
Place chicken in a large zip-top bag or glass bowl. Pour the marinade over it and massage or toss until every piece is fully coated.
Marinate
Refrigerate for at least 30 minutes. 2 to 4 hours is the sweet spot. Do not exceed 24 hours, or the citrus will break down the proteins and turn the chicken mushy.
Notes
Storage: marinade alone keeps for 5 days in the fridge / 3 months in the freezer.
Marinated raw chicken freezes for 2 months and marinates as it thaws overnight.
Cooked chicken keeps 4 days in the fridge.
Works on pork tenderloin or shrimp; just adjust the time down, as they don't need to marinate as long.