This was a great way to cook pork tenderloin! It had great flavor without taking too much away from the actual tenderloin, it had a bit of a kick so beware but it was great! I found the recipe on the Tasty Kitchen.
½ cups Balsamic Vinegar
2 Tablespoons Pure Maple Syrup
3 Tablespoons Yellow Mustard
3 Tablespoons Garlic Salt, Divided
1 pound Lean Cut Pork Tenderloin
⅓ cups Brown Sugar
2 Tablespoons Ground Mustard
1 Tablespoon Paprika
1 Tablespoon Ground Black Pepper
1 Tablespoon Crushed Red Pepper Flakes
Mix together the first three ingredients and 1 tablespoon of garlic salt. Marinate the pork tenderloin for 24 hours. If this isn't possible try to marinate it for at least 3 hours. Mix together brown sugar, ground mustard, garlic salt, paprika, black pepper, and crushed red pepper flakes. Rub on the pork tenderloin and grill over medium heat for 10 to 15 minutes on each side.