Notes: You can toast the walnuts (step 1) up to 2 days ahead; when cool, wrap airtight and store at room temperature.
Sunset DECEMBER 2003
1. In a 10- by 15-inch baking pan, mix walnuts with 1 tablespoon oil, the sugar, and 1/2 teaspoon salt; spread level. Bake in a 350° oven, stirring occasionally, until nuts are golden brown, about 15 minutes. Let cool.
2. In a large bowl, mix vinegar, shallots, mustard, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Slowly whisk in 1/3 cup oil until vinaigrette is emulsified. Add lettuce, grapes, red onion, tarragon, and sugared walnuts; mix gently to coat, adding more salt and pepper to taste.
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