The suggestion is 1/4 cup steel-cut oats is 1 serving, but I didn’t find that filling and Bob’s Red Mill gives 1/2 cup as the serving suggestion so that’s what I’ve used below.

1/2 cup steel cut oats
1/2 cup water
1 TBSP acid (I used milk kefir, but whey, yogurt, buttermilk, or ACV will work)

Let sit overnight. Drain and add a fresh cup of water and sprinkle of sea salt. Simmer about 10 minutes or until tender. I served with raw cream, rapadura, and cinnamon.