Bistecca with Balsamic Roasted Onions

Ingredients

• 3 large red onions or 15 cipollinis or boiling onions
• 1/4-cup plus 1 tablespoon extra-virgin olive oil
• Gray salt and freshly ground pepper
• 1 tablespoon minced garlic
• 1 tablespoon finely chopped fresh thyme
• 1/4-cup balsamic vinegar
• 1 large porterhouse steak, about 1-1/2 lbs. and 2 inches thick
• 1 tablespoon unsalted butter, cut into bits

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