Heat oil in a large Dutch oven over medium-high heat. Add chuck roast and cook until browned on both sides.
While roast is browning, stir together remaining ingredients in a bowl.
When roast is browned, pour sauce over it. Place lid on Dutch oven.
Place in oven for 4 hours.
Let meat cool for 15 minutes and then shred with 2 forks.
Notes
To give this dish more heat, add 1/2 teaspoon of crushed red pepper flakes.Leftovers will keep refrigerated for 4 to 5 days or can be frozen in a ziplock freezer bag for 2 to 3 months. Thaw overnight in the refrigerator.