Peel the tough, fibrous layers from the outer celery ribs. Split the ribs lengthwise and cut into 2 to 3-inch long pieces. Chop 2 tablespoons of the celery leaves, save the rest for other uses¿they are great in salads.
Put the celery, broth, olive oil, garlic, celery seeds, and thyme in a medium skillet. Season with salt and pepper. Bring the liquid to a boil over high heat, and then adjust the heat to maintain a gentle simmer. Place a circle of parchment paper directly on the vegetables or set a lid slightly ajar on the skillet. Cook until the celery is tender but not mushy, about 15 minutes. Transfer the vegetables to a serving dish, and reduce the cooking liquid to a saucy glaze. Remove the thyme sprig, and pour the cooking liquid over the celery, sprinkle with the cheese, and serve.
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