"You can shred the potatoes, onions, and celery root in a food processor with the shredding disk. However, you'll need to use 5 eggs (instead of 4) because the machine grates more coarsely and the mixture will require more binding...."
INGREDIENTS
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1 large celery root (celeriac; 1 1/2 lb), peeled with a knife
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1 1/2 lb large russet (baking) potatoes (about 3 large)
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2 tablespoons fresh lemon juice
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1 lb onions, quartered
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2/3 cup all-purpose flour
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4 large eggs, lightly beaten
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1 1/4 teaspoons salt
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1/2 teaspoon black pepper
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1/2 teaspoon ground celery seeds
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About 1 1/2 cups vegetable oil