Most of the “cooking” for this breakfast happens while you’re asleep.
In large saucepan, bring 3 cups water to boil over high heat. Turn off heat and slide saucepan to cool burner. Stir in oats and salt. Cover saucepan with lid and let sit overnight.
In morning, stir remaining 1 cup water into saucepan with oats and bring to boil over medium-high heat. Reduce heat to medium and cook, stirring occasionally, until mixture is creamy and oats are tender but chewy, 4 to 6 minutes.
If you think oatmeal comes in a packet, think again. They know about oatmeal in Ireland and Scotland, where whole-grain, steel-cut oats are popular. Yes, these slightly chewy oats take longer to cook than old-fashioned rolled oats (and way longer than instant oats in a packet), but the results are so much better. To shorten the usual half-hour cooking time, start the process at night and then finish up in the morning.