I started using the Cooks Illustrated Overnight Steel-cut Oats recipe last winter and loved it. Basically, the recipe is to oil water, add steel-cut oats, leftist it on your stovetop overnight, and finish the cooking in the morning. I made it a few times, and then one morning, I noticed that there was a strange green film on the surface when I went to add the milk and continue cooking. I assumed there was some problem with the pot or the oats, but I've now had this happen every time I've attempted the recipe since. I've tried different brands of oats, boiling the water for longer, putting the pot in the fridge, but to no avail. I don't know what the green stuff is - the pots it's out for about 8 hours, insufficient form old growth, it would seem - but it's unappetizing, and I can't bring myself to eat it.
Anyone had this problem? Have any suggestions or possible reasons for this? I have added salt to the water...could the cause this?
Any help would be appreciated!