Lemon and lime dal

Ingredients

• 3 tbsp groundnut oil
• 1 large onion, finely chopped
• 2 tsp cumin seeds
• 1 tsp salt
• 1 tbsp turmeric
• 2 chillies, thinly sliced
• 2 cloves garlic, chopped
• 250g red split lentils
• 1000ml vegetable stock
• 1 tsp dried mint
• 2 limes, zest and juice
• lemon, zest and juice
• 2 tbsp olive oil
• ½ tsp cumin seeds
• 1 clove garlic, finely sliced
• ¼ tsp cayenne pepper
• 1 tbsp fresh coriander