Place the diced rutabaga in a large saucepan and cover with water. Bring to a boil and then reduce heat and simmer until tender, about 20 minutes. Drain and mash. Set aside to cool slightly.

Preheat the oven to 350 degrees. Grease an ovenproof dish with butter.

Add 2 Tablespoons of the butter, the cream, breadcrumbs, salt, nutmeg and eggs to the rutabaga and stir to mix. Pour into the prepared dish and dot the surface with pats of the remaining butter. Bake for 45 minutes or until the top has lightly browned.