We almost ran out of sugar in 2021 and Rothera sent us a bag of Tate and Lyle in break-glass-in-emerhency box on one of the early transit flights the following summer. That's still hanging in the galley. Cream also goes pretty quickly, and forget about eggs. But you only need "egg product" anyway.
The foods that tend to be avoided are pasta and beans, or really anything which has to be boiled. There's a massive pressure cooker but it's a pain to use and clean. It's also hard to brew coffee if you tend to use off-the-boil. The best you'll get is about 93 C. Espresso is fine as its pressurised anyway.
We'd definitely have kidney beans in chili and some other dishes, but I got the impression it was a hassle otherwise.
> Re: coffee, mixing concentrated cold brew with hot water makes a pretty smooth cup
Friend and I ran a weekly pop-up espresso bar and did a lot of experimenting over the winter. The USAP "house" beans are quite dark, but at least they're roasted within a year or two because coffee is always available and we go through a lot of beans every season. Except the decaf. That stuff is decades old.
People often bring down a big bag from one of the roasters in Christchurch. We personally shipped down a lot of specialty coffee, mostly made V60 and aeropress. The outbuilding where our telescopes live also has a Chemex and an automatic.
There’s other tricks: various beans can be found in the form of instant powder or flaskes (1 min watering - no cooking) semolina (5 min watering - no cooking) and pre steamed (no watering - 10/20 min cooking). I bring those to hike on the mountain and use gaz only to make them hot. Mixed with cereals semolina, spices, herbs and oil/nuts its the perfect submit meal.
(See, e.g. https://brr.fyi/posts/pressure-altitude.)