Golabki (cabbage roll)

Bring a large pot of lightly salted water to a boil. Place cabbage head into water, cover pot, and cook until cabbage leaves are slightly softened enough to remove from head, 3 minutes. Remove cabbage from pot and let cabbage sit until leaves are cool enough to handle, about 10 minutes.

Remove 18 whole leaves from the cabbage head, cutting out any thick tough center ribs. Set whole leaves aside. Chop the remainder of the cabbage head and spread it in the bottom of a casserole dish.

Melt butter in a large skillet over medium-high heat. Cook and stir onion in hot butter until tender, 5 to 10 minutes. Cool.