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3 tablespoons vegetable oil
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2 cups sliced onions; large Bermuda or Spanish
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2-1/2 cups sliced leeks, about 3, cleaned thoroughly
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1 tablespoon fresh marjoram, chopped, or 1-1/2 teaspoons dried
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8 cups peeled, sliced potatoes, approximately 4 pounds
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3/4 cup buttermilk or plain low-fat yogurt
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1/2 teaspoon freshly ground black pepper, or to taste
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Pinch of ground cardamom (optional)
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1/2 pound fresh mushrooms, sliced
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1 tablespoon vegetable oil
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1/2 cup peeled, diced carrots, precooked
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1 cup peeled, diced potatoes, precooked
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