A crisp green salad is always a good idea. Here, two pleasantly bitter chicories -- frisee and radicchio -- are tossed with aromatic tarragon, crunchy pistachios, and a bright lemon-Dijon dressing.
Combine frisee, radicchio, and tarragon leaves in a serving bowl. In a small bowl, whisk together mustard, lemon juice, and sugar. Slowly whisk in oil; season with salt and pepper. Drizzle dressing over salad, tossing to coat. Sprinkle with pistachios and tarragon flowers and serve.
The vinaigrette can be made up to 3 days in advance.