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1 tablespoon Dijon mustard
2 tablespoons Champagne vinegar
1 small shallot, minced
1 tablespoon finely chopped chives
Kosher salt and freshly ground black pepper
1/4 cup extra-virgin olive oil
4 cups baby arugula
2 Belgian endives, thinly sliced
8 ounces white button mushrooms, sliced