How do you litter train rabbits?

Also, if you feed hay, a really good trick (which worked for my rabbit) is to put all the hay they eat in a day into the litter pan instead of a hay rack or some such, since they spend most of the day eating the hay, they will spend most of the day in the litter box and will ociate sitting in the box with using the bathroom. Don't worry about hygiene, rabbits won't eat pee or poo covered hay, which is why even if there is hay in the box the next day, you should clean it out and put new hay in, because it's left over because it's dirty and the rabbit doesn't want it.