Preheat the oven to 350?F.
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Pour enough oil to come halfway up the sides of a large heavy pot or electric deep-fryer and heat over high heat to 360?F.
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Combine the masa harina, Essence, and cumin in a shallow bowl. Dredge the oysters in the mixture, a few at a time, to coat evenly. Shake off any excess coating. In batches, without crowding, deep-fry the oysters, turning occasionally, until golden, about 2 minutes. Using a slotted spoon, transfer to paper towels to drain.
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Lightly beat the eggs and salt in a large bowl. Melt the butter in a large heavy skillet over medium-high heat. Add the green onions and chile pepper. Cook, stirring often, until softened, about 1 minute. Reduce the heat to medium. Add the eggs and, stirring constantly, scramble to the desired consistency.
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To serve, put one warm tortilla on each serving plate. Put an equal portion of the scrambled eggs and the oysters on each tortilla, then top each with 1/4 cup of the pico de gallo and 2 tablespoons of the sour cream. Serve immediately, passing the remaining pico de gallo at the table.
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Yield: 4 servings