In reply to kamon:
If you are in Peru, then you should have easy access to dried potato. This makes an excellent base for all sorts of meals, and is very quick to cook, as is cous cous. If you practice, you can make polenta for variety, and if you get really good use it like fresh bread. Or you can take flour and make chapatti or some other flat bread.
Pasta takes longer than dried potato or cous cous, and you have the hassle of draining it. On the other hand, super noodles are really quick. Any pasta will add substance to a soup.
Rice is tricky at altitude without a pressure cooker (lots of rice cooked on expedition with portable pressure cookers at altitude in India).
As has been said above, there's lots of stuff you can buy in tubes, like tomato puree. Some places sell tomato puree with olives, or basil, or garlic, for some different flavours. Small amounts of spices or other flavoursome sauces can add to you enjoyment of meals. Another favourite is some sundried tomatoes - you can get some that are ready to eat, and they make a great snack, or add flavour to tonight's stew.
Tins of tuna or other fish. Chorizzo or other dried sausage. Some cheese. All of these can add protein, fat, energy, vitamins, and taste to your cooking. And all can be eaten cold, so there is no health risk from not cooking them enough, and you can eat them cold if you lose or break your stove.
A small number of fresh veg will greatly add to the taste (and health) of your diet.
Take all of these, and mix and match throughout your expedition!
Experiment at home if you like.
Finally, in the UK we can now buy small cartons of wine, and we can buy olives in vacuum packaging. So there is no weight penalty from the packaging.
It is nice of an evening to sip some red wine and nibble olives and cheese as you wait for your meal to cook.
And in my homeland we have something called a "dram." My current preference is Laphroaig quarter cask, but I am very open to change (based on direct evidence, of course).