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1
For sauce: melt butter in heavy large skillet over medium heat.
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2
Add leeks, sugar and thyme.
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3
Season with salt and pepper.
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4
Cook until liquid evaporates and leeks begin to soften, stirring occasionally, about 10 minutes; do not brown.
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5
Transfer all but 1 cup leek mixture to bowl and reserve for garnish.
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6
Stir remaining leeks, reduce heat to low and cover.
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7
Cook until leeks are very soft and lightly caramelized, stirring occasionally, about 20 minutes.
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8
Puree caramelized leeks and stock in blender until smooth.
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9
(Can be prepared 1 day ahead.
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10
Cover reserved leeks and sauce separately and refrigerate.)
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11
For veal: Preheat broiler.
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12
Season veal with thyme and pepper.
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13
Melt 3 tablespoons butter in heavy large skillet over medium heat.
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14
Add veal and cook until just pink inside, about 4 minutes per side.
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15
Transfer to plate and cover to keep warm.
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16
Add brandy to skillet and cook until liquid is almost evaporated, scraping up any browned bits.
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17
Add cream and leek sauce and bring to simmer.
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18
Whisk in 6 tablespoons butter 1 piece at a time.
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19
Add cheese and any accumulated meat juices and whisk until smooth.
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20
Season with salt and pepper.
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21
Divide sauce among broilerproof plates.
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22
Top with veal and sprinkle reserved leeks over.
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23
Broil until leeks are heated through, about 1 minute.