Make paste of basil, chopped lemon grass (if not pre-prepared as paste) and chillies in mortar and pestle or food processor

Place paste with all other ingredients into a container or zip lock bag with pork tenderloin. Massage into and cover pork tenderloin with marinade. Marinate for at least 4 hours or overnight.

Grease grill and preheat using half of elements to 450-500f.

Grill directly over heat for 3 minutes per side or until slightly charred

Baste with remaining marinade, remove pork tenderloin from direct heat and continue cooking for 15 minutes or until internal tempurature is 145f.

Rest 5 minutes before cutting.