Preheat grill to medium-high. Melt butter in a saucepan over medium-high heat. Add onion and garlic; sauté 4 minutes, stirring constantly. Stir in brown sugar, vinegar, ketchup, and soy sauce; bring to a boil. Cook 6 minutes. Process mixture until smooth. Reserve 6 tablespoons sauce. Sprinkle pork tenderloins with salt; brush with sauce. Place pork on an oiled grill rack. Grill 6 minutes on each side or until thermometer registers 145°. Remove pork, and let stand for 5 minutes. Slice.
This recipe was excellent. The entire family enjoyed it. The pork was so juicy and full of flavor. The sauce was a little too tangy for my three-year-old's palate so he didn't use any of the reserved sauce for dipping, but it was delicious cooked on.
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