INGREDIENTS
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mayonnaise
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finely chopped cornichons or dill pickle
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whole grain mustard
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fresh lemon juice
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sugar
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Kosher salt and freshly ground black pepper
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skinless firm white fish fillets (such as cod, haddock, or grouper)
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olive oil
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Kosher salt and freshly ground black pepper
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large egg
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mayonnaise
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finely grated lemon zest
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fresh (or frozen, thawed) corn kernels
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chopped fresh chives
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panko (Japanese breadcrumbs), divided
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(or more) vegetable oil
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Lemon wedges (for serving)