Set up grill for direct cooking over medium heat.
In a bowl, stir to combine beans, mustard, mesquite sauce and bacon pieces.
Pour bean mixture into 8-inch cast iron skillet. Cover beans with bacon slices. Cook on covered grill for 30 minutes.
INDOOR: Preheat oven to 350 degrees F. Prepare beans as directed and pour into a 2-quart oven proof casserole. Bake in oven 35 to 40 minutes or until beans have thickened and are bubbling.