With lots of altitude gain and long days alpine climbing I used to carry a hard salami with a large brick of the hardest cheese I could find. A bunch of Canadian Crackers - Stoned Wheat and lots of water. I would snack on it all day long so at the end of the day a quick meal of the same along with some GORP kept me fueled. I always enjoyed a cup of hot tea - Sweet Touch Nee or one of the British blends like Tetley or PG Tipps with some creamer (you used to be able to get the individual serving of half and half that did not require refrigeration and some sugar cubes. Other than the tea there was really no cooking required. Add some bananas, apples, oranges or other easily carried fruit and you are good to go. I would often opt for dried fruit because it was easy to carry and did not weigh as much. Also love dried candied ginger - good for the digestion. A nice glass of chardonnay at the end of the day was also a welcome treat. Hate carrying bottled wine though.

Also used to try Long Range Patrol Rations (US Army), but seldom C Rations. The new Meals Ready to Eat are pretty good also.