Make the vinaigrette: In a small bowl (or a jar with a watertight lid), whisk together (or shake) the ingredients until emulsified.
In a mixing bowl, combine the arugula with a handful of toasted nuts and grated Parmesan (don’t skimp). Add a drizzle of dressing and toss until the salad is lightly coated throughout. If desired, toss in the suggested add-ins. Serve immediately.