Wash the smelts with the juice of the lime or lemon and rinse with cool water. Drain well.
Season the smelts with the salt, half of the black pepper, and the Caribbean green seasoning. Mix well to fully coat the fish . Prepare your frying station with the flour in a bowl, a paper towel-lined plate, and a wok or deep pan with vegetable oil heated for frying.
Dust the seasoned smelts lightly in the flour and fry for 5 to 7 minutes until golden and crisp. As they fry, the kitchen will immediately remind you why simple seafood dishes are often the most satisfying. Drain and set aside.
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Pour the water into the same bowl used to season the smelts and reserve, so none of that flavor goes to waste.
Once all the smelts are fried, heat the remaining vegetable oil in a saucepan on medium heat. Add the onion, garlic, and scotch bonnet pepper and cook for 1 minute until fragrant.
Add the roasted geera, anchar masala, remaining black pepper, and curry powder. Reduce the heat to low and cook for about 4 minutes, stirring occasionally to toast the spices evenly and release their aroma. The scent of the spices cooking away will perfume the entire kitchen with that unmistakable Caribbean warmth.
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Add the reserved water (with rememnts of marinade) to the pot and bring the heat back up to medium-high. Allow the curry sauce to reduce by about 25 % and deepen in color and flavor.
Add the fried smelts back to the pan and spoon the curry sauce over them to coat evenly. Simmer for 3 to 4 minutes until the sauce thickens and the smelts absorb that rich Caribbean curry goodness. If the sauce becomes too thick, add a bit more water.
Taste and adjust the salt to your liking. Finish with the chopped cilantro or coriander and serve warm with coconut rice or hot sada roti for the full experience. Were I still based in Trinidad and Tobago, I'd use chopped Chadon Beni (culantro) instead of the cilantro.