In a Mason jar, combine 6 tablespoon olive oil, 3 tablespoon lemon juice, ½ teaspoon salt, ¼ teaspoon pepper, 1 tablespoon Dijon mustard, ½ teaspoon sugar, and 1 grated clove of garlic. Put the lid on the jar and shake until the vinegarette is emulsified.
Make the salad
Put the arugula into a large mixing bowl. Add the desired amount of vinegarette, and then toss to coat.
Portion the arugula onto 4 plates. Top with roasted beets, crumbled goat cheese and Proscuitto.