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2 lb 10 oz (1.200 k) beets, trimmed, leaving 1 inch (3 cm) of stem attached
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1 lb (450 g) onions, peeled, halved and cut in thin slices |
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3 tablespoons unsalted butter |
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2 teaspoons balsamic vinegar |
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¼ cup extra virgin olive oil |
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½ lb (200 g) parmesan cheese in thin slices with a vegetable peeler |