- Combine 1 cup each of coconut milk and water in a saucepan, place over high heat until boiling. Add beef and simmer for 20 mins or until the meat is tender.
- While simmering meat, stir-fry massaman curry paste with oil over low heat until fragrant. Slowly add the remaining coconut milk, fish sauce, sugar and tamarind puree. Mix well.
- Combine curry mixture into the meat and continue cooking over medium high heat. Bring to the boil before adding potatoes.
- Continue simmering until potatoes soften. If too dry, some water can be added. Garnish with peanuts before removing from heat. Serve with rice.