Grilled Pork Tenderloin

In a small bowl, whisk together brown sugar, paprika, cumin, and salt. Stir in olive oil to form a paste. Spread paste all over tenderloin. Heat grill or grill pan to medium-high heat. Grill pork, turning occasionally with tongs, until charred and a thermometer inserted into the thickest part of the tenderloin reads 145°, about 20 minutes. (For larger tenderloins, bake in a 400º oven for 15 to 25 minutes more, until desired internal temperature is reached.)  Make herb sauce: In a medium bowl, stir together all ingredients and season with salt and pepper.  Let rest 10 minutes, then slice and serve with herb sauce.