2 Granny Smith or other tart apples–cored, halved and thinly sliced
1/4 cup white wine vinegar
1 Tbs Dijon mustard
2 Tbs minced shallot
1 tsp sugar
salt and pepper
1/3 cup olive oil
8 cups mixed salad greens
Directions
Preheat oven to 350ºF. Spread walnut pieces on a rimmed baking sheet. Bake walnuts for 5 to 8 minutes, stirring every 2 minutes, until just toasted. Pour into a bowl to cool.
Place apples in a bowl and toss with 1 Tbs vinegar.
In a small bowl, whisk together remaining vinegar, mustard, shallot, and sugar; season with salt and pepper.
Whisking constantly, drizzle in olive oil and continue to whisk until smoothly blended.
Place salad greens, apples, and walnuts in a large bowl. Toss with dressing just before serving.