This vegetarian salad is hearty, satisfying, and easily stored for work lunches.
Dividing evenly between 2 airtight containers, layer arugula, scallions, chickpeas, tomatoes, and walnuts; cover, and refrigerate up to overnight.
In 2 more airtight containers, divide vinegar and oil for vinaigrette; season with salt and pepper. Cover and store at room temperature. To serve, shake vinaigrette in containers to combine; pour over salads, and toss.