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1
In a medium bowl, beat the eggs together to mix well. In the bowl of a food processor fitted with the metal blade, pulse the onions, scraping them. down a few times, until very finely chopped, almost a puree. Scrape the onions into the bowl with the eggs and stir them in.
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2
Drain the potatoes, then set a strainer over a bowl. In the same processor bowl, process the potatoes until very finely chopped but still with some texture. Immediately scrape into strainer. With a rubber spatula or the back of a spoon, press out the moisture so it drains into the catch bowl. Immediately stir the potatoes into egg mixture. Discard liquid and potato starch collected in bowl. Add the matzo meal, salt, and pepper. If not using a tarnished silver spoon (see above), add a pinch of cream of tartar. Stir well; let stand while oil is heating.
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3
Heat about 1/8 inch oil in a large skillet over medium-high heat until very hot. Spoon out the batter, using a scant 1/4 cup for each pancake. The batter should sizzle as soon as it hits the fat, but not wildly. If the edges of the batter separate, the oil is too hot. If there are just slight bubbles when the batter touches the oil, the oil is not yet hot enough. The first round of latkes is inevitably less good than later batches.
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4
Fry the latkes for about 4 minutes on the first side, slightly less on the second. They should be well browned before turning them. Drain on absorbent paper or on a rack. Serve immediately.
