INGREDIENTS
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1 4-pound beef chuck roast, (see Ingredient note), trimmed of fat
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1/2 teaspoon salt, or to taste
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Freshly ground pepper, to taste
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4 teaspoons extra-virgin olive oil, divided
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2 large onions, halved and thinly sliced (4 cups)
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4 cloves garlic, minced
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1 teaspoon dried thyme
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3/4 cup strong brewed coffee
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2 tablespoons balsamic vinegar
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2 tablespoons cornstarch mixed with 2 tablespoons water