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1
Combine water and 1/4 cup oil in a small bowl. Whisk together flour and salt in a large bowl, then add liquid in a slow stream, whisking until combined well. Whisk in yolk until smooth.
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2
Beat egg white in another small bowl with cleaned whisk or an electric mixer until soft peaks form, then fold into batter. Let batter stand at room temperature 1 hour.
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3
Cut corn kernels from cobs using a large knife without cutting very deeply into cobs, then, working in a shallow dish, scrape cobs with back of knife to release remaining kernels and liquid. Gently stir kernels with liquid into batter.
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4
Put oven rack in middle position and preheat oven to 200u00b0F.
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5
Heat remaining 3 3/4 cups oil with garlic in a 12-inch heavy skillet (about 1 inch deep) over moderately high heat until thermometer registers 375u00b0F. Remove garlic when golden.
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6
Fry heaping tablespoons of batter in batches of 6 or 7 in hot oil, without turning, until fritters are deep golden, about 4 minutes. Return oil to 375u00b0F and skim out any bits of batter between batches. Transfer fritters to paper towels with tongs to drain, then transfer to a shallow baking pan and keep warm in oven. Season with salt before serving.