It's amazing what you can make up using the limited amenities in your standard hotel room!
What can/have you made up using your (sterilized) kettle/coffee maker/iron etc. Assuming you've brought along the basics mini can opener/bottle opener/tin cup/foil/mug/cutlery/seasoning etc in your kit.
Not that one always eats this way, I certanly don't. But it's convenient to have a few things on hand when you're in a hurry or in a pinch.
What do you like to bring from home to prepare later?