To Store: Store leftovers in the refrigerator for 2-3 days. The arugula does wilt as it sits, so if you’d like to preserve its texture, store the arugula separately, then mix it with only the portion of the chickpea/tuna mixture you plan to eat that day. I also like to wake up my leftovers with a little extra dressing or squirt of lemon juice and a pinch of kosher salt.