"I cook a steak weekly."
Translation:Cucino una bistecca settimanalmente.
Generally you can make an adverb in italian by adding "mente" at the end of an adjective and similarity for nouns. Settimana becomes Settimanalamente and means weekly. There are two verbs "to cook" cucinare and cuocere. Cuocere is basically " cook it in the oven" "cook for 5 minutes" The delicate art of cooking is best described by cucinare.