Heat oil in a large pot or wok over medium-high heat. Add beef brisket pieces and brown on all sides until golden.
Remove beef and set aside. In the same pot, sauté onion, garlic, and ginger until fragrant.
Add curry powder and stir constantly for 2 minutes to release the spices.
Pour in beef stock and coconut milk, stirring well to combine.
Return beef to the pot. Add lemongrass, fish sauce, salt, and black pepper.
Bring to a boil, then reduce heat to low. Cover and simmer for 45 minutes until beef is tender.
Add diced potatoes and tomato quarters. Simmer uncovered for 15 minutes until potatoes are cooked through.
Taste and adjust seasoning with salt if needed. Remove lemongrass.
Transfer to serving bowl and garnish with fresh cilantro and sliced red chili.
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