Cut tenderloin lengthwise almost in half. Open; lay flat between two pieces of waxed paper. Pound with meat mallet or rolling pin to 1/2-inch thickness.
Place garlic, onion, cilantro, lime juice and jalapenos in food processor or blender; cover and process until coarsely chopped. Process, while slowly adding oil, for 10 to 15 seconds or until mixture is almost smooth.
Spread half of cilantro mixture over pork loin; top with cheese. Roll up; tie with cotton string. Spread remaining cilantro mixture over the top. Place on rack in roasting pan.
Bake for 55 to 60 minutes or until internal temperature of 160 degrees is reached. Cool in pan on wire rack for 5 minutes. Remove string and slice.