Lamb in Buttermilk Curry Recipe

Ingredients

• 4 cups buttermilk plus 1 cup water
• 3 lbs leg of lamb or stewing beef, fat trimmed, in 2 inch cubes
• 2 tbsp coriander seeds
• 1/2 cup canola oil
• 1 1/2 tbsp cumin seeds
• 3 tbsp chopped garlic
• 10-15 2 inch pieces dried red chilies
• 15 cloves
• Seeds from 10 black cardamom pods
• 1 tbsp salt
• 10 oz potato (1 large), mashed