from my Moroccan experience.. It's nice living with a Moroccan man who knows how to cook hehehe. :)
leaves of romaine lettuce ( or any leafy kind ) cut in half
red onion ( diced finely ) or half circled
tomatoes peeled and diced
table oil ( vege oil, safflower, sunflower ect.)
1mix onion and tomato together with oil.
2on a plate arrange lettuce neatly.
3gently fill lettuce with mixture making it easily accesible for finger food..
4sprinkle salt over top and serve room temp or chilled.. can accompany any meal