Kosher salt and freshly ground black pepper, to taste
1 ounce Parmesan, grated (about 1 cup)
Directions
Make the vinaigrette: In a small bowl, combine the lemon zest and vinegar and allow to sit for 10 minutes.
In a food processor, combine the egg yolk, salt, mustard, garlic, anchovies, Worcestershire and lemon-Champagne vinegar mixture and process until smooth. In a steady stream, drizzle in the canola oil, followed by the olive oil, and pulse until smooth. Set aside. Make ahead: The vinaigrette can be made the day before, covered and chilled.
Make the broccolini: Place a large cast-iron skillet over medium-high heat and warm 1 tablespoon of the oil until it begins to shimmer. Working in 3 batches, char the broccolini, adding more oil as needed and turning occasionally until the vegetables are evenly caramelized, 10 to 12 minutes per batch. Season with salt and pepper and transfer to a work surface to cool to room temperature.
Cut the broccolini on an angle, into 2-inch-long pieces and transfer to a platter. Drizzle the vinaigrette over the broccolini. Sprinkle the Parmesan on top and serve.