Open the can of coconut milk without shaking it to separate the cream from the milk. Remove most of the cream for frying.
Cut the beef into chunks and coat with curry paste in a pot.
Add the remaining coconut milk and water, bring to a simmer, and cook until the meat is almost tender.
Add shrimp paste, onions, and potatoes to the pot. Ensure the vegetables are covered in liquid.
Season with rock sugar, fish sauce, and lemon juice. Simmer until the vegetables are softened.
Add peanuts and continue simmering until everything is tender.
Check the meat for tenderness and adjust seasoning if needed.
Allow the curry to cool overnight to thicken and enhance flavors.
Reheat before serving with rice. Enjoy!
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