Stir together minced garlic, next 3 ingredients, 1 tablespoon soy sauce, and 2 teaspoons honey.
Spoon garlic mixture evenly over pork, rubbing well into pork.
Place pork on a rack coated with cooking spray in an aluminum foil-lined roasting pan.
Bake at 350° for 30 minutes or until a thermometer inserted into thickest portion registers 155°. Remove from oven; cover pork loosely with aluminum foil, and let stand 10 minutes.
Cut pork diagonally into slices. Place slices on a serving platter.
Whisk together vinegar, sesame oil, chili garlic sauce, remaining 1 tablespoon soy sauce, and remaining 4 teaspoons honey. Drizzle evenly over pork. Sprinkle evenly with onions and cilantro. Garnish, if desired.