The Capital-Style Blistered Asparagus with Lemon Mosto and Hollandaise

Before you start

• Clarify the butter.

  Melt the unsalted butter in a heavy saucepan over low heat without stirring or boiling. Let it stand for five minutes, skim the white whey foam from the top, and carefully ladle the golden butterfat into a measuring cup, leaving the milky water behind. You need it to be exactly 125°F when you build the sauce.

• Set up the bain-marie.

  Bring one and a half inches of water to a rolling boil in a medium saucepan, then immediately drop the heat to maintain a bare, gentle simmer. Find a rounded stainless-steel mixing bowl that nests over the pan comfortably.

Ingredients

• egg yolks3 large
• unsalted European-style butter12 oz
• cold water2 tbsp
• fresh lemon juice1 tbsp
• cayenne pepper1/4 tsp
• jumbo asparagus1 1/2 lb
• high-smoke-point oil1 tbsp
• kosher salt1/2 tsp
• black pepper1/2 tsp
• dried porcini mushroom powder1/4 tsp
• lemon mosto olive oil2 tbsp
• fleur de sel1 pinch
• lemon1/2 med

Method

1. 01

   Whisk the yolks, water, and lemon juice off the heat.

   Combine the egg yolks, cold water, and strained lemon juice in your mixing bowl. Whisk vigorously off the heat until entirely combined and slightly frothy.

2. 02

   Build the emulsion over the simmering water bath.

   Place the bowl over the simmering saucepan, ensuring the bottom absolutely does not touch the hot water. Whisk constantly in a figure-eight motion for two to four minutes until the mixture pales, doubles in volume, and leaves fleeting trails. If the bowl gets too hot to touch, pull it off the heat for ten seconds so you don't scramble the eggs.

3. 03

   Emulsify the clarified butter into the yolks.

   Remove the bowl from the heat entirely and rest it on a damp towel to keep it from spinning. Whisking frantically, add the 125°F clarified butter drop by literal drop. Once the emulsion stabilizes and thickens, pour the remaining butter in a slow, steady thread until thick and glossy. Season with the cayenne pepper and salt to taste, then hold in a pre-warmed thermal carafe.

4. 04

   Blister the asparagus in a screaming-hot skillet.

   Place your largest cast-iron skillet over high heat until it is smoking aggressively. Toss the trimmed asparagus with the high-smoke-point oil, drop them in a single layer, and leave them completely undisturbed for ninety seconds to develop a deep, dark caramelized blister. Roll with tongs and cook for two to three more minutes until vibrant green and snappy. Do not let them go limp.

5. 05

   Season, dress, and serve immediately.

   Move the hot spears to a warmed platter and instantly toss with the kosher salt, black pepper, and porcini dust. Drizzle generously with the lemon mosto so the heat volatilizes the citrus oils. Finish with a pinch of fleur de sel, garnish with the grilled lemon half, and serve the hollandaise in a warm sauceboat alongside.

Notes

• Don't panic if your hollandaise breaks.

  If the sauce looks greasy or separates at the edges, immediately whisk in a tablespoon of rapidly boiling water. If it shatters entirely into an oily puddle, whisk a fresh yolk with a splash of lemon juice over the water bath until thick, then slowly drizzle your broken sauce into the new yolk exactly as you did the butter.

• Synthesize your own Mosto if you can't source the real thing.

  True Ligurian Mosto is cold-pressed with whole lemons. To fake it, gently warm half a cup of high-quality extra virgin olive oil to 140°F with long strips of Meyer lemon zest—leaving all the bitter white pith behind. Steep for two hours and discard the peels.

• Use high-quality ghee in a pinch.

  If clarifying butter feels like a bridge too far for a weeknight, buy a jar of premium organic ghee. It's essentially cooked-down clarified butter; it brings a slightly nuttier flavor but possesses the exact chemical properties required for a flawless, stable emulsion.