Put a rimmed baking sheet on a rack positioned in the center of the oven and preheat the oven to 425 degrees F.
Toss together the celery root, oil, cumin, 1 teaspoon salt and a few grinds of black pepper in a large bowl. Carefully remove the hot baking sheet from the oven and spread the celery root on it in an even layer.
Roast until the celery root is lightly browned and very tender, about 25 minutes, stirring occasionally. Transfer to a serving bowl and toss with the parsley leaves and pomegranate seeds. Drizzle olive oil over top.
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