E.S.
My first thought was a broccoli salad. This is the recipe I use:
http://allrecipes.com/recipe/alysons-broccoli-salad-2/det...
I also make a yummy corn salad to go with BBQ...but with the corn, it might be too much starch? I'll share my recipe anyway. :)
4 ears corn, cooked and then cut from cob
1 tomato, seeded & chopped
1 green pepper, chopped
1 banana pepper, seeded & diced
1/2 cucumber, seeded & diced
1 green onion, chopped
handful of cilantro, chopped
1/4 cup salted peanuts, chopped
1/4 cup goat cheese crumbles
1 1/2 Tbsp. lime juice
1 tsp. rice vinegar
2 tsp. olive oil
Kosher salt & freshly ground pepper, to taste
Just mix it all up, adding the peanuts and goat cheese crumbles last. I would at least double the above for 15 people though!