no kitchen for 3 weeks what to make?

I'm in the same situation, kitchen remodel. I guess I didn't really think it was going to be that big of an inconvenience....I was so wrong! Like others have suggested, I pulled out the slow cooker and made exception soup and stews. We have the fridge available, which is a HUGE plus. Canned potatoes, green beans, tuna, all wonderful as well.

slow cooker meals, they are so easy or your grill. I re-did my kitchen and made soup each weekend in the slow cooker and just has a microwave in my living room. But I also did a lot of grilling or foil packets on the grill with veggies, etc.

Electric tea kettles are also a huge help--great for boiling water for couscous and bulgur, and for giving a head start to that pasta water on that single burner!

I think a slow cooker would be very handy. Great for whole chickens cooked down in own juice, pot roast, soups, stews. If you have any interest in owning a toaster oven you might find that helpful also as long as you are cooking for only a few people. I have baked many a pasta or casserole type dish in toaster oven.

My neighbor remodeled her kitchen after I had remodeled mine. She did 2 things I wish I'd done - she had her kitchen sink temporarily plumbed into her basement (I missed the sink more than anything) and she used a slow cooker.

Eat out and explore some new restaurants for inspiration you can use in your new kitchen.

Any chance you have a rice cooker around? Or are they are as cheap in Denmark as in the US? Making things in the rice cooker was something my parents relied on when they were renovating their kitchen because they also had to clean up in buckets or the bathroom sink and it is very easy to clean in a bucket compared to a full pot/pan.

You can hydrate lots of grains besides rice following the regular directions, to eat with a simple salad, seared meat (and if it were me a vinaigrette over all three). Simple food, but you can change up each component to have increased variety. In addition, there are a handful of weird things you can make in a rice cooker that you would normally bake in the oven, like frittatas and curries, this lifehaker list looks like it has all of the techniques I know: http://lifehacker.com/15-surprising-things-you-can-make-in-a-rice-cooker-1707586076

One-pot pasta dinners are great!
Salads are easy too. Actually just google posh student meals and you will find a ton of recipes! And congrats with the new kitch! :)