Different approaches for lunch: when I was driving a tipper or fuel tank truck, I just took a crate of a single fruit kind for my lunch. Sometimes during the cherry season, I stopped under a wild cherry tree and climbed on the top of the truck to have my lunch of wild cherries.
As I was busy, I didn't feel hungry till dinner. But then I had a really good raw meal with some animal food first, vegetables, perhaps a kind of nuts, and a bit later a fruit species.