My girlfriend and I tend to get them about once a month at a local restaurant and have no problem with them. Could it be something else in the meal? For instan

My girlfriend and I tend to get them about once a month at a local restaurant and have no problem with them. Could it be something else in the meal? For instance, our restaurant serves it with vegan Bun, Cheese, and 1000 Island dressing; all sourced from other local businesses. Maybe it's one of those toppings?