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1
In a medium bowl, mix together sour cream (or yogurt), lemon zest, basil, chives, and anchovy (if using). Season with salt and pepper. Set aside or refrigerate until ready to serve.
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2
Preheat oven to 250u00b0F (120u00b0C) and set a wire rack in a rimmed baking sheet. Grate zucchini on the large holes of a box grater, or use the shredding blade of a food processor. Transfer shredded zucchini to colander set over a bowl or in the sink. Repeat with the onion, then add to the zucchini.
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3
Toss zucchini and onion with 1 teaspoon salt and let stand for 10 minutes. Using your hands or a clean dish towel, squeeze out as much of the liquid from the zucchini and onion as possible. Transfer zucchini mixture to a large bowl and add corn kernels. Stir in eggs, garlic, black pepper, flour, baking powder, and shredded cheese until thoroughly combined and no dry flour remains.
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4
In a large cast iron or heavy stainless steel skillet, heat 2 tablespoons oil over medium-high heat until shimmering. Working in batches to avoid crowding the pan, carefully drop scant 1/3 cupfuls of the zucchini batter into the skillet, then press down on them with the cup measure to flatten them to about 1/4 inch thick.
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5
Cook until the bottom side is golden brown, about 4 minutes (the corn will have a tendency to pop in the hot pan, so be careful; you may want to use a splatter guard or lid to shield yourself). If the fritters darken too quickly, reduce the heat to medium. Flip the fritters and cook until browned on the other side, 2 to 3 minutes longer. Transfer fritters to the prepared baking sheet then keep warm in the oven. Repeat with remaining batter, keeping the pan well-oiled as you go.
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6
Serve fritters warm, with a dollop of herb sour cream on top.
