1 (3 to 5 lb) beef chuck roast
salt and pepper
4 tablespoons olive oil, divided
2 dried guajillo peppers, soaked stemmed and seeded
2 dried ancho peppers, soaked stemmed and seeded
1 chipotle in adobo
3 garlic cloves, minced
1 tablespoon cider vinegar
1 tablespoon brown sugar
1 teaspoon salt
1 teaspoon dried oregano
½ teaspoon ground cinnamon
¼ cup water
1. Place dried peppers into a bowl or jar and fill with water until covered. Soak 1 to 4 hours until softened.
2. Season chuck roast with salt and pepper. Heat a large cast iron pot over high heat. Add in 2 tablespoons olive oil. Sear chuck roast on all sides. Once seared, remove pot from heat and set aside.
3. In a blender, add in guajillo peppers, ancho peppers, chipotle, garlic, cider vinegar, brown sugar, salt, oregano, cinnamon, remaining 2 tablespoons olive oil, and water. Blend until smooth, adding more water if necessary, to thin it out enough to blend.
4. Place seasoned chuck roast in a Slow Cooker. Make sauce according to directions and pour over meat. Cook on high 6 hours, or low 8 to 10 hours.