Fried Potatoes

6 medium potatoes
1 onion, — finely chopped
4 tablespoons butter
1 1/2 teaspoons salt
3 dashes pepper

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Pare potatoes and cut into thin slices. Melt 2 tablespoons butter in heavy skillet. Spread potato slices in 3 layers, each one slice thick, sprinkling each layer with 1/2 teaspoon salt, a dash of pepper and chopped onions. Dot top layer with 2 tablespoons butter. Cover; cook over medium heat 20 minutes. Uncover; cook until potatoes are brown, turning once.