Running down quite a collection of food photos I've yet to publish, but will, here's a salad from a couple of months ago.
There's some baby greens that form the base, baby spinach, onion and celery, green and red bell pepper (1 slice each, not chopped), and cucumber. For the protein, one can of white whole albacore tuna spiced with salt, pepper, paprika and cumin, all toped with kalamata olives. Dressings now are simple, and never from a bottle. Greek kalamata olive oil and about a half lemon squeezed on top.
Yea, it was delicious. Maybe 5 minutes, start to finish. Depending on your lean body mass, the tuna alone can account for 1/4 – 1/2 of your daily protein requirement.