4 cups (120 g) watercress, tough stems trimmed 2 cups (40 g) baby arugula 1 medium fennel bulb, cored and very thinly shaved (plus 2 tbsp / 8 g chopped fennel fronds) 1 crisp apple (Honeycrisp or Pink Lady), cored and very thinly sliced 4 radishes, very thinly sliced 1 small shallot, very thinly sliced 1 / 3 cup (35 g) walnuts, toasted and roughly chopped 1 / 3 cup (20 g) shaved Parmesan or aged Gouda 2 tbsp (30 ml) red wine vinegar 1 tbsp (15 ml) fresh lemon juice 1 tsp Dijon mustard 1 tsp prepared horseradish (or 1 / 2 tsp if strong) 1 / 2 tsp honey 1 / 3 cup (80 ml) extra-virgin olive oil 1 / 4 tsp kosher salt, plus more to taste Freshly ground black pepper to taste
Toast the walnuts in a dry skillet over medium heat until fragrant and lightly browned, 3–4 minutes; set aside to cool. In a large bowl, combine watercress, arugula, shaved fennel, apple slices, radishes, shallot, and chopped fennel fronds. In a small bowl, whisk together red wine vinegar, lemon juice, Dijon, horseradish, and honey. Slowly whisk in olive oil until emulsified; season with salt and several grinds of black pepper. Just before serving, drizzle about two-thirds of the vinaigrette over the salad and toss gently to coat. Add more dressing to taste. Top with toasted walnuts and shaved Parmesan (or gouda). Finish with a pinch of salt and freshly ground pepper. Serve alongside the pot roast to cut richness and refresh the palate.
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