This meal is a splurge so when we have it we really love it and savour it. For such a complex tasting dish it's surprisingly easy to prepare. In medium skillet roast 2 tablespoons each whole peppercorns and cumin. You'll know it's ready when the smell of the spices really hits you. Put them on a cutting board and crush them all with the back of your pan. When that's done cover your pork tenderloin with dijon mustard and then roll it in your crushed spices.
Place your fully coated tenderloin on a foil lined cookie sheet and bake at 400F 25 minutes, or until the juices run clear when you pierce it with a fork. Before you pick this delightful little roast up with your bare hands and eat it like a caveman make sure you let it sit for 5 minutes. By doing this you'll let the juices and flavours distribute evenly through the whole tenderloin. Slice into little tranches of meat and serve with seasonal veggies and buttered potatoes.