Honestly, been there with my own guys and the mystery meat special. Tbh the bathroom breaks after those things turn a 30 minute lunch into a two hour adventure. Ngl I had to start bringing extra rolls of toilet paper to the job site as a hint. Might be cheaper to just buy them a slow cooker for real chili.
Three gas station runs a day for hot dogs seems excessive. Have you actually tracked how much time is lost to bathroom breaks versus real work? Maybe a simple log would show them the cost of their craving.