The radicchio delivers nice color, but endive or escarole hearts would be smart substitutions flavorwise.
Ingredients
1/2 cup walnuts
2 tablespoons Champagne vinegar or Riesling vinegar
2 tablespoons fresh lemon juice
1 tablespoon finely chopped shallot
1 tablespoons whole grain mustard
1/3 cup grapeseed oil or olive oil
Kosher salt, freshly ground pepper
1 teaspoons thyme leaves
3 cups watercress, tough stems removed
1/2 head of radicchio, halved lengthwise, core removed, leaves separated
6 baby carrots, scrubbed, thinly sliced into rounds
4 baby turnips, preferably Tokyo, tops trimmed to 1/2", scrubbed, very thinly sliced lengthwise
2 oranges, peel and white pith removed, sliced into rounds, seeds removed
1/4 cup kumquats, sliced into rounds, seeds removed (optional)
Flaky sea salt (for serving)
Directions
Preheat oven to 350°F. Toast walnuts on a rimmed baking sheet, tossing once, until slightly darkened in color and fragrant, 8–10 minutes. Let cool; coarsely chop.
Whisk vinegar, lemon juice, shallot, and mustard in a medium bowl. Whisking constantly, gradually add oil. Whisk until emulsified; season vinaigrette with kosher salt and pepper. Stir in thyme.
Toss watercress, radicchio, carrots, turnips, oranges, kumquats (if using), and toasted walnuts in a large bowl. Drizzle with vinaigrette, season with sea salt and pepper, and toss again to coat.
