Preheat oven or grill to 400°F. F.

In a large bowel mix the cabbage, potatoes, carrots, and onion.

In a 9x13 baking dish, add half the butter pieces to the bottom.

Add the vegetable mixture to the pan.

Top with rest of butter pieces.

Add the beer to the pan.

Sprinkle with salt and pepper, if desired.

Cover the pan with foil.

Bake for 45 minutes. Stir and bake another 45 minutes.