Grilled Fall Vegetable Salad with Boiled Dressing

Preheat the oven to 400°. Put the beets in a small baking dish, cover with foil and bake for about 40 minutes, until tender. When cool enough to handle, peel and halve the beets and transfer to a large rimmed baking sheet.

Bring a large saucepan of salted water to a boil. Add the carrots and boil over moderately high heat until crisp-tender, about 4 minutes. With a slotted spoon, transfer to the baking sheet. Add the turnips to the boiling water and cook until just tender, about 3 minutes; transfer to the baking sheet. Repeat with the asparagus, cooking until bright green, about 2 minutes; transfer to the baking sheet. Add the leeks and cook until just tender, about 2 minutes; transfer to the baking sheet. Halve the carrots, turnips and leeks lengthwise. Drizzle the vegetables with olive oil and season with salt and pepper.

In a medium stainless steel bowl, whisk the egg yolks with the vinegar, flour, mustard, sugar and cayenne pepper until smooth. Set the bowl over a saucepan of simmering water and whisk over low heat until hot and thick, about 2 minutes. Remove the bowl from the heat. Whisk in the butter, then the cream, crème fraîche, 1 tablespoon of the lemon juice and the lemon zest. Season with salt and pepper.

Light a grill or preheat a grill pan. Grill the blanched vegetables over medium heat, turning once or twice, until lightly charred, about 5 minutes.

On a platter, toss the arugula with the 2 teaspoons of olive oil and the remaining 2 teaspoons of lemon juice; season with salt and pepper. Arrange the grilled vegetables over the arugula and serve the boiled dressing on the side.