Skate Wings with Cabbage and Leeks

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4 skate wings

2 large yellow onions, halved

1 bunch fresh thyme or 2 tablespoons dried, crumbled

1 head garlic, separated into cloves and crushed

Salt and freshly ground pepper

1/2 small head of savoy cabbage, cut lengthwise into eighths

1/3 cup best-quality sherry wine vinegar

6 tablespoons unsalted butter, chilled and cut into small pieces

2 medium leeks, white and pale green parts only julienned, Sauteed in butter