In a large stock pot, heat the dende oil over mediumlow heat. Add the onion, garlic, ginger, and chiles. Cook for about 10 minutes, stirring occasionally, until the vegetables are well softened. Add the tomatoes, lime juice, ground shrimp, and cashew butter and stir together for 1 minute more. Begin adding the chicken stock, 1/2 cup at a time, stirring all the time to keep the mixture smooth. Add the coconut milk, cilantro, salt, and Tabasco.

When ready to serve, brush a very large, deep skillet or saucepan with a little oil and place in the fish in a single layer. Place the pan over mediumlow heat and, when it just begins to sizzle, pour in the broth mixture and slowly bring up to a simmer. Cook for about 8 minutes, or until the fish is opaque, adding the shrimp for the last 2 minutes of simmering time. Distribute the fish evenly among 6 or 8 bowls. Taste the broth for seasoning and pour over the fish. Squeeze a wedge of lime over each bowl and drop it in. Garnish with cilantro sprigs, if desired, and serve.

Note 1: Dende oil is Brazilian palm oil, available in Latin American markets. Be sure to get the Brazilian rather than the West African product, which is much heavier. Or use half the amount of the West African palm oil and substitute vegetable oil for the other half.

Note : The ground dried shrimp that are used in Brazilian dishes can occasionally be found in WestAfrican markets, but the variety that is widely available in Chinese markets will do nicely. The easiest way to grind them is in a coffee grinder, if you have one which is reserved for grinding spices.