Making a side salad can take a lot of time. Instead, purchase a cheap compartmentalized serving tray with a lid (less than $5 at Walmart), cut up your lettuce and a few veggies of your choice and keep them in the fridge in this serving tray.
I found a basic serving tray at Walmart or a dollar store. I chop up lettuce, tomatoes, onions, cukes, etc. That way they are always ready to go and I am not washing and preparing a salad for a half hour each meal.