What you need:
For the beef:
- 8 cloves minced garlic, divided
- 1 Tbsp. salt
- 1 Tbsp. ground black pepper
- 1/4 tsp. cayenne pepper
- 2 Tbsp. molasses 
- 2 Tbsp. yellow mustard
- 3 to 4 lb. chuck roast or flat cut brisket
- 1 onion, sliced into slivers
- 1 Tbsp. vegetable oil
- 1 cup beef broth
For the horseradish jalapeno sauce:
- 1 tsp. horseradish
- 1 cup sour cream
- 1 clove minced garlic
- 1 pickled jalapeno
- Salt to taste
Directions:
- Combine 2 cloves minced garlic with salt, pepper, cayenne, molasses, and mustard to form a paste.
- Rub paste all over brisket and let sit at room temperature for 1 hour. 
- In an ovenproof pot (cast iron or Dutch oven, etc.), heat vegetable oil over medium-high heat.
- Add onion to pot and cook until they begin to brown at the ends.
- Add remaining 6 cloves minced garlic with beef broth and scrape the bottom to get any cooked bits.
- Add beef, fat side up, and spoon the cooked onions over the top. Cover with the lid.
- Cook in a preheated 250 degree oven for 5 to 6 hours or until brisket falls apart with a fork.
- After the beef is put into the oven, make horseradish jalapeno sauce by stirring together all ingredients and refrigerating until serving time.
- Remove from oven, uncover, and allow brisket to rest for 20 to 30 minutes before serving. If using roast, skip the resting. 
- Serve with horseradish jalapeno sauce.
Recipe slightly adapted from Country Cleaver
Posted on Fantastical Sharing of Recipes