Sweet and sour beet

4 medium beets (4 oz/115 g each) 3 tablespoons raw cane sugar 1 tablespoon cornstarch (cornflour) or all-purpose flour ¼ cup (2 fl oz/60 ml) vinegar 1 teaspoon salt ⅛ teaspoon ground black pepper 2 tablespoons (30 g) butter 1 medium white onion, halved and sliced

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