Do this
Cut a circle of parchment a little smaller than the pot. Cut a small hole in the middle. Lay it right on the food. Keep the heat at a gentle simmer.
Why it works
The broth boils up, hits the lid, and falls back down. The top of each piece gets seasoned without stirring. Less stirring means potatoes keep their shape.
When to skip it
Skip it when you want the sauce to thicken fast. The lid slows down evaporation. Take it off for the last few minutes.
