Try this salad -
Sliced skirt steak, shredded pork, diced chicken, steamed and shelled shrimp and chives. I call it the Salad of Awesome. And the chives are totally optional.
That said, a lot of people have a hard time digesting raw vegetables. Most of it is actually *digested* by bacteria in your guy (you weren't really built to digest the stuff) and as they digest it they poop toxins into your system that build up as gasses and eventually explode outward - along with all the insoluble fiber in your system that even the friendly bacteria can't help you knock off.
So yeah, not an uncommon problem, particularly if you don't fortify your system with it regularly.
Eat steak, peanuts, corn, peas, and black beans for dinner.
See which items you can still identify when it comes out the other end. These are the ones your body couldn't digest.