Sautee small-ish pieces of either chicken or pork fillet in some butter, adding in plenty of freshly-ground black pepper. When just about done (to your liking), add the evaporated milk then a HEALTHY splash of a nice sweet sherry. Let it all bubble up a bit, then serve (particularly scrumptious with some fresh fried potatoes which are a bit more delicate to use to sop up the extra sauce than one's tongue).
We fight over this sauce at our house. It's just amazing! Yes, you could use cream instead (and we have done so) but the evaporated milk in this case is just as good.