Ingredients
2 1/2 tablespoons white wine vinegar
1 small shallot, minced
2 teaspoons Dijon mustard
2 tablespoons walnut oil
2 tablespoons extra-virgin olive oil
Kosher salt and freshly ground pepper
2 bunches of watercress, thick stems discarded (about 14 ounces)
1 pound jumbo lump crab, picked over and drained
2 celery ribs, thinly sliced
1 Granny Smith apple, cut into 1/2-inch dice
1/3 cup walnuts, coarsely chopped

Directions
1. In a bowl, whisk the vinegar with the shallot and mustard. Whisk in the walnut and olive oils and season with salt and pepper.
2. In a medium bowl, toss the watercress with 3 tablespoons of the dressing. In another medium bowl, gently toss the crab with the celery, apple, walnuts and the remaining dressing. Season with salt and pepper. Transfer the watercress to plates, top with the crab salad and serve.