Spiced Welsh Lamb loin with dahl

Ingredients

• 1 PGI Welsh Lamb eye of loin fillet
• 1 tbsp oil
• Small knob of butter
• ½ tsp crushed coriander seeds
• ½ tsp fennel seeds
• ½ tsp coarse ground black pepper
• Pinch of salt
• 400g red lentils, rinsed
• 2 tsp turmeric
• 25g butter
• 2 tbsp cumin seeds
• ½ tbsp oil
• 1 small onion, finely chopped
• 2 garlic cloves, finely chopped
• 1 green chilli, finely chopped
• 1 tsp garam masala
• Small carton of natural yogurt
• ½ tsp turmeric
• Handful of fresh coriander, chopped
• Chapatis