Tell me what great salad I can make myself tonight?

He’s having steak so I’m having salad which happens a lot. Here is what I have that I can use. This has to keep me reasonably full until morning: I have:
an avocado
a can of black beans
a head of leaf lettuce; bag of mixed lettuce
red and yellow onions
croutons
green onions
tomatoes
What would you use for your big dinner salad? I already have the dressing I’m using; I won’t eat salad dry or with just lemon juice. lol Thanks so much for your suggestions!