Beef Chilli with Bitter Chocolate

Ingredients

• 4 tbsp vegetable oil
• 500g/1lb 2oz good-quality beef steak, finely diced
• 500g/1lb 2oz good-quality beef mince
• 1 white onion, peeled, finely chopped
• 1 red onion, peeled, finely chopped
• 2 sticks celery, trimmed, chopped
• 1 dried chipotle chilli
• 1 tbsp dried chilli flakes
• ½ tbsp chilli powder
• 2 tsp dried oregano
• 3 tbsp light brown sugar
• 2 x 400g/14oz cans chopped tomatoes
• 500ml/17fl oz beef stock
• 1 x 400g/14oz can kidney beans, drained and rinsed
• 1 x 400g/14oz can black-eyed beans, drained and rinsed
• sea salt flakes and freshly ground black pepper
• 75g/3oz plain chocolate, minimum 70% cocoa solids, roughly chopped
• bunch fresh coriander
• cooked steamed rice
• 8 tbsp soured cream
• 4 spring onions, trimmed, finely sliced