Slow Cooker Mongolian Beef | This recipe is a winner, just take 15 minutes to prep your ingredients and fire it all into the slow-cooker or casserole pot 🔥 Have the dinner made ahead in the morning and leave the slow cooker to do all the work - handy! Serves: 4 1.5kg flank steak or skirt steak, thinly sliced 4 tbsp cornflour 2 peppers, chopped 2 sweet potatoes, cut into chunks 6 garlic cloves, finely sliced 1 thumb sized piece ginger, finely sliced 1 red chilli, finely sliced 1 tbsp sesame oil