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Heat oil in a large skillet over medium heat. Add shallots, garlic, ginger and mustard seeds; cook, stirring often, until the shallots have softened, 3 to 5 minutes.
Add chili powder, coriander, cumin and turmeric; cook, stirring, until fragrant, 1 to 2 minutes.
Add the tamarind mixture, okra, chiles, brown sugar and salt. Bring to a simmer. Cover and cook until the okra is tender, 6 to 8 minutes.
Add tomatoes and stir to combine. Add fish, submerging the pieces in the liquid as much as possible. Return to a simmer. Cover and cook until the fish is opaque in the center, 3 to 5 minutes.














