@wjt roasted vegetables - as long as the rental has a baking pan/sheet pan - it is easy and versatile and scalable (and vegan / gluten free). All you really need is olive oil, salt and pepper but of course you can add herbs/spices. It’s also nice to mix in onions/garlic with root vegs or squashes. Eggs - versitle and fast and for a large group lots of options to make in large batches and also don’t require lots of spices etc just good butter or oil plus veggies for a scramble etc.