Preheat oven to 225°F.

Brush the bottom of a heavy Dutch Oven with melted butter.

Spread half of the sliced potatoes on the bottom of the pot.

Top the potatoes with pork chops.

Sprinkle the chops with salt and pepper.

Layer the sliced onions on top of the chops.

Sprinkle the onions with more salt and pepper.

Cover with the remaining potatoes, ensuring the top layer doesn't touch the lid.

Pour in the stout beer.

Brush the potatoes with the remaining melted butter.

Sprinkle the potatoes with the remaining salt and pepper.

Cover the pot.

Bake for 8 hours, checking periodically to ensure it isn't drying out.

Add water, 1/4 cup at a time, if needed.

Remove from the oven.

Let cool for 20 minutes before serving.