Combine rice, water, and butter (optional) in a pot and bring to a boil. Cover with a tight-fitting lid, reduce heat to low-simmer, and cook for 45 minutes. Remove from heat (with lid on!) and steam for 10 minutes. Fluff with fork.

If rice is crunchy at the end of cooking time, it may be necessary to add 1-2 Tbsp. liquid and cook longer.