Lunch on my tours is typically eaten as a series of small snacks, and technically I consider any meal part of "lunch" if it is eaten after I start riding for the day and before I get to camp. I probably wouldn't eat everything in the photo above on any given day, but sometimes come shockingly close to that ideal.
A couple other notes:
- On the average, I'd expect something over half of the daily food weight to be considered "lunch".
- A fast breakfast might often roll into lunch with the addition of coffee. In some cases then "breakfast" might be a granola bar, an apple, and a cup of coffee.
- Cream cheese or hummus are sometimes welcome on my tortillas as well for variety
- The ziploc containers that tortillas, beef jerky, and nuts come in can also be used as trash bags as the days go by
- On "energy bars". There are quite a variety and availability can be limited to nonexistent depending on where you are. Snickers bars can be fine as a substitute. The fancy and expensive Bhu and Core bars are marginally healthier for you, but require refrigeration and are difficult to find. Also, caffeinated Clif Bars are a powerful tool if used wisely, usually one is good for about 25 miles of riding
- One thing not shown here is electrolyte supplements. That might be a powdered drink mix, it might be like those weird Nuun tablets (although personally I prefer the Hammer Endurolyte Fizz tablets). Clif Bloks are good if you can find them. But it might be the little "Emergen-C" packets you see in gas stations.
- None of the above implies that a deli salad, a cheeseburger, or a bag of chips would be beneath me on a long day!