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1
Make flan: Put oven rack in middle position and preheat oven to 325u00b0F.
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2
Butter an 8- by 2-inch round cake pan and line bottom with a round of wax paper, then butter paper.
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3
3Steam asparagus in a steamer set over boiling water, covered, until very tender, 6 to 8 minutes.
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4
Puree asparagus in a food processor until smooth, 1 to 2 minutes.
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5
(You will have about 2 cups puree.) Whisk together eggs, milk, cheese, salt, pepper, and nutmeg in a bowl, then whisk in asparagus puree.
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6
Pour asparagus mixture into pan and bake in a hot water bath until flan is set and a wooden pick or skewer inserted in center comes out clean, 50 minutes to 1 hour.
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7
Transfer pan to a rack to cool slightly, 10 to 15 minutes.
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8
Make sauce while flan cools: Put all sauce ingredients in a metal bowl, then set bowl over a pan of barely simmering water.
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9
Heat sauce, whisking until cheese and butter are melted, and then stirring with a wooden spoon, until sauce is slightly thickened and registers 165u00b0F on an instant-read thermometer, 5 to 8 minutes.
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10
Remove bowl from pan.
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11
Run a thin knife around edge of flan to loosen, then invert a serving plate over pan and invert flan onto plate.
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12
Remove pan and discard paper.
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13
Cut flan into wedges and serve immediately with sauce.
