Baby arugula is less spicy than the longer leaf variety.
Look for small bags of prewashed, baby arugula leaves (about 3-inches long) in the produce section of natural foods stores and supermarkets. It will be less spicy than long arugula leaves. If you can’t find arugula, substitute a spring salad mix or baby greens salad mix. Layer and divide tuna-white bean salad ingredients on 4 serving plates or containers with lids. Combine dressing ingredients in a small jar. Cover, shake, then spoon over salads before serving, or divide between 4 small bottles, then cover, and refrigerate for packed lunches. Serve grapes for dessert.