Slow Cooker Ancho Coffee Shredded Beef

Bahan-bahan (6 porsi)

• 2 tablespoons finely ground coffee beans
• 2 tablespoons ancho chile powder
• 2 tablespoons dark brown sugar, tightly packed
• 1 tablespoon smoked paprika
• 1 tablespoon kosher salt
• 2 teaspoons ground cumin
• 2 teaspoons black pepper
• 3 -4 pounds boneless chuck roast
• 1 Spanish onion
• 4 cloves garlic
• 2 tablespoons chipotles in adobo, minced
• 1/4 cup maple syrup
• 1 cup beer
• 2 tablespoons balsamic vinegar
• 2 tablespoons cornstarch, or as needed