Rub the cubed lamb with the ground turmeric. Place a small frying pan over low heat and dry-roast the coriander seeds until aromatic. Remove and dry-roast the cumin seeds, then repeat with the chillies. Grind them all to a powder in a pestle and mortar or spice grinder. Add six curry leaves, the garlic and ginger and grind to a paste.
Dry-Roast the fennel seeds in the pan until they bro