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1
In a large skillet, toast the cumin seeds over moderate heat until fragrant, about 1 minute.
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2
Transfer the seeds to a plate to cool, then coarsely chop them.
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3
Preheat the oven to 350.
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4
Heat the olive oil in the skillet.
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5
Season the fish with salt and lots of pepper.
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6
Add the fish to the skillet and cook over moderately high heat until browned on the bottom, about 3 minutes.
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7
Turn the fish and continue cooking over moderate heat until barely opaque throughout, about 4 minutes longer.
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8
Transfer the fish to a plate.
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9
Add the onion to the skillet, cover and cook over low heat until softened but not browned, about 5 minutes.
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10
Add the cumin and olives and cook, stirring to blend the flavors.
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11
Return the fish to the skillet and gently break it up with a wooden spoon.
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12
Season with salt and pepper.
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13
Warm the tortillas in the oven for 30 seconds, or just until hot but still pliable.
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14
Keep the tortillas warm in foil.
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15
To serve, toss the lettuce with the tomatoes and cucumber in a bowl.
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16
Transfer the fish mixture to another bowl.
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17
Set out the sour cream and hot sauce.
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18
Let guests build their own tacos with the fish, salad, sour cream and hot sauce.