Send them their favorite thing to eat. They will be happy they have their favorite thing, and happy you know what it is.
Sometimes it's just that simple.
And bonus for you, they might even be super appreciative and share (hooray for food loving friends)! Live with a Midnight snacker? Give them 3 kilos of Nutella. Friends with a Cheese lover? Sign them up to get cheese delivered to their doorstep every month. If they're learning how to cook, send them our collection of pantry training wheels. Or if they just love a good brunch, send them all the bacon spread and cocktails they can handle.