By Florence Fabricant of NYTimes
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3 ½ pound chicken, cut in 10 pieces (breasts halved, backbone and wingtips removed)
1 tablespoon unsalted butter
Salt and ground black pepper
1 medium red onion, finely chopped
2 cloves garlic, thinly sliced
¼ cup sherry vinegar, preferably Pedro Ximénez
¼ cup chicken stock
1 teaspoon ground cardamom
1 pound seedless red grapes, cut into small clusters leaving stems attached
3 sprigs fresh thyme
1 tablespoon high-quality syrupy balsamic vinegar or pomegranate molasses