chilli con carne

• 1 tbsp oil
• 1 large onion
• 1 red pepper
• 2 garlic cloves , peeled
• 1 heaped tsp hot chilli powder (or 1 level tbsp if you only have mild)
• 1 tsp paprika
• 1 tsp ground cumin
• 500g lean minced beef
• 1 beef stock cube
• 400g can chopped tomatoes
• ½ tsp dried marjoram
• 1 tsp sugar
• 2 tbsp tomato purée
• 410g can red kidney beans
• plain boiled long grain rice , to serve
• soured cream , to serve