I've been asked to bring a green salad to a cookout Sunday.

We have tons of various lettuces growing, so there will be plenty of that, but I wonder if and what else you add.

I'm thinking a diced zucchini,
scallions,
celery,
a few radishes...

then I draw a blank. Do you leave it more greens/lettuce or keep adding. I know some folks have problems digesting raw onions, so only a few scallions....
what would YOU add to a green salad if you were bringing one?