Mustard is one of my favorite sauce bases for meats....especially on pork and lamb.  This sauce could be used on just about any smoked or grilled meat.  In this recipe, the sauce crusts slightly, but still is soft beneath the outer crust.  If you use this sauce on a larger cut of meat like a pork shoulder or pork butt, the sauce will form more of a full-on crust, that is really delicious, due to the longer cooking time.  This recipe also pairs really well with my Savory Roasted Potatoes.