You said tenderloin, but the only recipe I found for cooking in a dutch oven is for a Boston butt roast. I'm including (if I don't run out of space!) one of each. 1st one works with beef or pork. Beef a bit more pricey, but it is heavenly! (And you must like garlic! So good for you, too!)
Tenderloin W/Creamy Garlic Sauce
1-8 oz. jar Dijon mustard, divided
10-cloves garlic, divided
2-T. whole blk. peppercorns, coarsely crushed, divided
3-T. Olive Oil (EVOO)
1-4 to 5 lbs. tenderloin, halved
2-Cups heavy whipping cream
1-Cup (8 oz.) sour cream
1. In a blender, combine half of the mustard, 8 cloves garlic, & 1-T. crushed peppercorns. Cover & process for 1 min., scraping sides of blender to fully incorporate mixture. Add 1-T. olive oil, process until a paste forms. Spread over tenderloin.
2. In a large skillet, heat the remaining oil over med. high heat. Brown meat on all sides. Transfer to an ungreased 13"x9"x2" baking dish (use your Dutch oven if meat isn't over-crowded!). Cover & bake @ 375F for 40-50 min, or until meat reaches desired doneness (Beef= rare 140F; med. rare 160F; well done, 170F. Pork = 160F.)
3. Remove to warm serving platter. Let stand 10-15 min. Mince remaining garlic.
4. In a saucepan (I use same skillet as one used to brown meat), combine remaining minced garlic, whipping cream, sour cream, and remaining mustard, & crushed peppercorns. Cook & stir over low heat until heated through. Slice meat & serve W/sauce. Serves: 12-15
Pork Roast
2-T. Olive Oil (EVOO)
1-T. A.P. Flour
1-3-1/2 to 4 lb. boneless Boston butt pork roast
1/2-Cup chopped fresh Sage Leaves & Rosemary (3-T. Each Dried)
1/4-Cup fresh Thyme (2-T. dried)
10-cloves minced garlic
2-tsp. salt (I only use Kosher or Sea salt, coarse ground)
1-1/2 to 2 oz. (3-3-1/2 T.) Bourbon*
2-T. softened unsalted Butter
3-4 Cups chicken stock
Preheat oven to 300F. Heat the oil in Dutch oven over med. high heat. Rub the flour over the meat, place in Dutch oven, brown all sides of meat, abt. 5 min. on ea. side. Remove pork from Dutch oven & set aside.
Place Sage, Rosemary, Thyme, Salt, Bourbon, & Butter in a small bowl & stir until you have a paste. Rub all over the pork roast and return to Dutch oven.
Pour 3 cups of the chicken stock around the pork, cover, & place in oven. Cook for 5 hrs. After 3 hrs. check and add remaining cup of chicken stock if sauce looks too dry. Remove from oven & let sit 15 min. before slicing. Serve W/gravy from the pan.
* LOL-thought this would be perfect for "Jack Bourbon"! :biga: