INGREDIENTS
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1stick (1/2 cup) unsalted butter, plus more for the baking dish
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12ounceswide egg noodles
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1pound(1 bunch) asparagus, trimmed and cut into 1-inch pieces
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1cupfrozen peas
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1cuppanko bread crumbs
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kosher salt and black pepper
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1/2small onion, finely chopped
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1/3cupall-purpose flour
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5cupswhole milk
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8ouncesCheddar, grated (about 2 cups)
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25-ounce cans tuna, drained
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1tablespoonchopped fresh tarragon or 1 teaspoon dried tarragon