¼ cup coarse-grain mustard 3 tablespoon cider vinegar 3 tablespoon sugar ¼ cup peanut or vegetable oil ⅓ cup dry cured sausage, such as soppresata, pepperoni, or salami, cut in 1/4- to 1/2-inch pieces Freshly ground black pepper and kosher salt ½ cup torn fresh curly-leaf parsley 2 tablespoon thinly sliced green onions
