A few decades ago, I traveled a couple of hundred miles every other weekend to Before CA I5 was built, and part of the trip was trough the town of Vacaville (Cowville) where there was an Onion dehydrating plant. It was the most pleasant segment of the trip, since I love onion.
An ancillary claim to fame was the famous (now closed) Nut Tree Airport which attracted private flyers for 100 mile radius, to visit the Nut Tree Restaurant, which housed a fantastic bookstore and civil and military aviation souvenir shop. Flying in there for a meal was always memorable.
Not all food odors are irritating.
True and I am familiar with Vacaville. The smell can be unpleasant.