You don't boil it first.
This sounds like how I make it but I can't find my recipe offhand.
Mine tells me to use short grained arborrio or Italian rice.
It is a fairly small amount like 1/2 or 1/3 of a cup of arborrio for a full quart of whole milk.
Mine simmers for about 45 min and it is great cold.
I wonder if you are not using the correct rice,not using enough milk or not cooking it long enough. If you want recipe you could contact me and I will dig it out.
I love this recipe because you don't have to bake it or use eggs.
Sorry those people are wrong!
I know the recipe you mean and you can cook the rice slow in milk and it makes very nice rice pudding. The only other thing I can suggest is if you are not keeping it moist enough or covered. There would be no problem pouring a small amount of milk over to keep it moist.
Are you using whole milk - that makes it creamier. If you are trying with skim or 1% it might not be creamy enough.
Argh - of course plain steamed rice does that - BECAUSE IT IS DRY- this is rice cooked slow and creamy in whole milk. Keep it moist it will not be hard.