10 Ounce Soy Sauce 1 - 2 Lb Tenderloin
3/4 Cup Dark Brown Sugar 2 Tbl Red Hot
3/4 Cup Light Brown Sugar 1/2 Lb Bacon
Mix the soy sauce and sugars, pour over the tenderloin. Marinade at least 3 hours. Remove from marinade, DO NOT discard marinade.
Wrap the tenderloin in bacon and hold with toothpicks. Bake at 350 degrees until meat registers 5 - 10 degrees below done (done is 140 for medium venison, 145 for medium beef). Baste with reserved marinade while baking. When meat reaches the 5 - 10 degrees below done, remove it from the oven to a hot cast iron or other heavy skillet and finish it in that pan so the outside is crisp.
If you don't have a cast iron pan, use the heaviest pan you have. If you don't like crisp bacon, you can skip this step.