INGREDIENTS
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1 1/2 tablespoons unsalted butter, plus more as needed
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1 large shallot, finely chopped
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1 small tomato, finely chopped
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2 tablespoons white wine vinegar
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2 tablespoons chopped fresh tarragon
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Kosher salt and freshly ground pepper
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8 ounces thin green beans or haricots verts
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3/4 cup cornmeal
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8 3-ounce trout fillets, pin bones removed
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1/2 cup half-and-half