Slow Cooker Ropa Vieja (Cuban Shredded Beef)

Name: Slow Cooker Ropa Vieja (Cuban Shredded Beef)
Prep time: 40 min
Total time: 40 min
Cuisine: Cuban
Ingredients: 1 medium yellow onion (chopped); 1 green bell pepper (cored and chopped); 1 (15-ounce) can tomato sauce; 1 (7-ounce) can green chilis; 2 Tbsp tomato paste; 1 Tbsp dried oregano; 2 tsp ground cumin; 2 tsp sea salt; 2 Tbsp cider vinegar; 1/2 tsp red pepper flakes (optional); 1/2 tsp black pepper; 2 lbs beef chuck roast (use up to 3 lbs); 2 tsp garlic powder; 1/2 tsp sea salt; 1 Tbsp olive oil; 6 large red potatoes (chopped); 2 Tbsp avocado oil (+ more for frying); 2 large plantains (peeled and sliced); 1/2 small head red cabbage (thinly sliced); 4 Tbsp fresh lime juice; 2 vine-ripened tomatoes (chopped); 1/2 cup cilantro (chopped, optional)