BBC Food - Recipes - Splendidly spicy beef burger

Ingredients

• 1 tbsp sunflower oil or rapeseed oil, plus extra for brushing
• 1 large onion , finely chopped
• 2cm/¾in piece fresh root ginger , very finely chopped or ground to a paste
• 2 garlic cloves, very finely chopped or ground to a paste
• 1-2 green bird's-eye chillies , seeds removed, very finely chopped
• 800g/1lb 14oz lean beef mince
• pinch salt
• 2 tsp ground cumin
• 3 tsp ground coriander
• ½ tsp ground turmeric (optional)
• 1-2 tsp mild chilli powder , to taste
• 2 tbsp chopped fresh coriander
• 1kg/2lb 4oz potatoes , unpeeled, cut into wedges
• 1 tbsp rapeseed oil or vegetable oil
• 2 tsp mild red chilli powder
• 1 tsp freshly ground white pepper
• 2 tsp salt
• 1 heaped tsp mango powder (optional)
• 4-6 burger buns
• ketchup