Boiled potatoes (I diced @ 2.5 lb, very small or just mash them)
Little bit of minced or grated onion (1/4 of a small one)
fresh parsley (lots, I used the whole bunch)
lemon juice or vinegar (I used the juice of one large lemon, @2 Tbsp.)
oil (Olive, 1/4 cup maybe?)
salt. (just a pinch)
Casbah put a little mayo in it, so sometimes I use about 2 Tbsp. Not always.
Garlic, hot pepper, black pepper, harissa, red pepper and grated tomatoes are options.