INGREDIENTS
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1 medium onion, halved lengthwise, then sliced crosswise (1 cup)
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1 tablespoon vegetable oil
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1 large head leafy green cabbage (3 pounds)
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1 teaspoon minced garlic
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3/4 teaspoon salt
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1/4 teaspoon black pepper
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2/3 cup water
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2 lb large boiling potatoes
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1 cup well-shaken buttermilk
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3 oz extra-sharp white Cheddar, coarsely grated (1 cup)
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2 tablespoons drained bottled horseradish
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3/4 stick (6 tablespoons) unsalted butter
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3/4 cup coarse fresh bread crumbs from a country-style loaf
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Accompaniment: Irish bacon