Whisk lime juice, soy sauce, garlic, tamarind paste, sugar, and sambal oelek together in a bowl. Whisk marinade for 1 minute; pour into a resealable plastic bag. Poke pork tenderloin with a fork or knife. Add to the bag, coat with. marinade, squeeze out excess air, and seal the bag. Marinate in the refrigerator for 8 hours to overnight (for best results).
Preheat an outdoor grill for high, indirect heat and lightly oil the grate.
Remove pork loin from marinade and shake off excess. Discard remaining marinade.
Sear on the preheated grill over direct heat, 1 to 3 minutes per side; move to indirect heat until cooked through, 20 to 30 minutes more, depending on thickness.
Garlic-Tamarind Pork Loin · Dinner Match Lab | Dinner Match Lab