Persimmon, Pomegranate, and Frisee Salad

For the sugared walnuts:
Heat oven to 350ºF. Line a baking sheet with parchment paper.

Put walnuts in a small bowl. Pour very hot tap water over the walnuts for 1 minute, then drain. Add sugar and fleur de sel. Mix to coat nuts evenly, then spread them on the parchment. Bake for 7 to 10 minutes, until crisp and caramelized. Cool, then break walnuts apart. (Sugared walnuts may be prepared up to 5 days ahead. Store in the cupboard in an airtight container.)

For the vinaigrette:
Put shallots in a small bowl. Add a pinch of salt and the sherry vinegar. Let mixture steep for 10 minutes. Whisk in walnut oil. Season to taste with salt and pepper. Set aside.

For the salad:
Core and cut persimmons into 1/2-inch-thick wedges and transfer to a large platter with a well. Salt persimmons lightly, then dress with some vinaigrette. Add the frisee, radicchio and chicory leaves and gently toss with hands to coat leaves, pulling persimmon pieces to the top. Scatter pomegranate seeds over the top, along with any collected juices. Garnish with sugared walnuts and serve.