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In a small bowl, stir together the paprika, garlic powder, thyme, cayenne, 1/2 teaspoon salt, and 1/4 teaspoon pepper.
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In a medium saucepan, combine the quinoa, chicken broth, and 1/4 teaspoon salt. Bring to a boil, cover, reduce heat to low, and let simmer until all the liquid is absorbed and the grain is soft, 17 to 20 minutes. Remove from heat, covered. Set aside.
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Halve the lemon. Juice one half and cut the other half into wedges. Reserve separately.
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Brush the lemon juice over the fish, then coat the fish with the spice mixture. Set aside.
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Heat the oil in a medium nonstick or cast-iron skillet over medium-high heat. Add the fish in one layer and cook until it begins to blacken, and its center looks opaque, 2 to 3 minutes. Flip and cook the other side, 2 to 3 minutes more
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Fluff the quinoa with a fork. Fold in the black beans, butter, herbs, and 1/2 teaspoon salt. Place some quinoa on 2 dinner plates, add the fish and lemon wedges, and serve.