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1
Heat the oven to 325 degrees F and arrange a rack in the middle.
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2
Bring 8 cups of the water to a simmer in a large saucepan over high heat; keep at a simmer.
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3
Spray 6 (6-ounce) ramekins with cooking spray or coat them with vegetable oil.
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4
Arrange them 1/2 inch apart in a large roasting pan; set aside.
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5
Bring the remaining 1 cup of water to a boil over medium-high heat in a small saucepan.
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6
Season with salt, add the peas, and return to a boil.
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7
Reduce the heat to medium and simmer until the peas are tender, about 5 minutes.
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8
Drain the peas and place in a blender.
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9
Add the remaining ingredients and blend until smooth, about 20 seconds.
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10
Place a fine-mesh strainer over a large measuring cup or a bowl with a spout.
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Pour in the custard, gently pushing on it with a rubber spatula to work it through the strainer.
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12
Remove the strainer and discard the solids.
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13
Evenly divide the custard among the ramekins.
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14
Tap each ramekin a few times to break any bubbles that appear on the surface.
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15
Being careful not to get water inside the ramekins, add enough of the simmering water to the roasting pan so that it reaches halfway up the sides of the ramekins.
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16
Cover the pan tightly with aluminum foil.
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17
Carefully transfer the pan to the oven and bake until the outer 1 inch of each custard is set (the centers will still be slightly jiggly), about 30 to 40 minutes.
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18
Using tongs, carefully transfer each ramekin to a wire rack and let cool at least 20 minutes before serving.
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19
If serving the custard chilled, let cool to room temperature, cover tightly with plastic wrap, and chill in the refrigerator for at least 1 hour and up to 1 day.
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20
When ready to serve, place the vinegar, mustard, and egg yolk in a clean blender and blend until smooth.
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21
With the motor running, slowly drizzle in the oil and continue blending until smooth.
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22
Taste and season with salt and pepper as needed; set aside.
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23
Using a vegetable peeler, slice the asparagus lengthwise into thin strips and place in a medium bowl.
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(If you have trouble peeling the final portion of an asparagus spear, lay it on the flat wooden handle of a spatula or spoon.
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This will raise it just high enough to allow the peeler to move freely.)
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26
Add 2 tablespoons of the dressing to the asparagus and toss to combine; set aside.
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27
Place the lettuce, chives, and parsley in a large bowl and toss to combine.
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28
Add 1/4 cup of the dressing and toss to combine.
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29
Taste and season with salt and pepper as needed.
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30
To serve, run a thin knife around the perimeter of the ramekins.
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31
Invert each ramekin onto a plate.
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32
Divide the lettuce mixture among the plates next to the custard.
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33
Divide the asparagus over the lettuce.
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34
Serve, passing the remaining dressing on the side.