1 C short-grained rice (do not use basmati or other long-grained rice, it won't work)
1 liter of whole milk (to start with)
combine the two in a pan and heat up slowly to a gentle boil, stirring constantly (that's the hard part)
keep adding milk, possibly even up to another liter as the rice absorbs it. this takes a good hour, but you have to keep testing the rice, you'll know when it's close enough to done to "put to bed"--by which i mean wrap it up in a big quilt in the midst of the pillows on your bed--for about 20 minutes or so. it will finish cooking this way. serve with a big dollop of butter and plenty of sugar and cinnamon.
i personally would use 1.5 C rice, but husband says a cup. if you're going to sit there for an hour stirring, you might as well have plenty. and you can always form the leftovers into pancakes, roll them in a bit of flour to hold them together and fry them up in some butter and eat them with a bit of sugar & cinnamon sprinkled on.
risengrød isn't very photogenic, so no photo with this post.