Beef and bean chilli with sweet potato

Ingredients

• 2 large sweet potatoes
• 2 rashers smoked bacon, chopped
• 1 tbsp olive oil
• 1 onion, finely chopped
• 2 garlic cloves, finely chopped
• ½ x 500g pack Co-op beef mince
• 1 tsp chilli flakes
• 1 tsp cumin
• 2 tsp paprika
• ½ tsp ground cinnamon
• 1 pepper (red, yellow or orange), chopped
• 1 tsp oregano
• 1 x 400g tin chopped tomatoes
• 1 tbsp tomato purée
• 2 x 400g tins kidney and/or mixed beans, drained and rinsed
• 500ml beef stock
• Guacamole, to serve
• Chopped coriander, to serve (optional)