You can always omit the capers if they aren't your thing! But feel free to add whatever sounds good. I'm a fan of Trader Joe's onion salt for this recipe (as noted in the ingredients), but I've used the everything but the bagel seasoning as well in this, and it's great! If you're looking for added crunch, pickles or celery work great, and I've added them at times to my egg salad too!