ステーキはミディアムで焼いて下さい。

steak

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

medium

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

to burn; to roast; to broil; to grill; to bake; to toast; to barbecue; to heat; to heat up; to make (charcoal, pottery, bricks, etc.); to bake; to fire; to burn; to tan (i.e. suntan); to burn; to print (a photo); to burn (an optical disc); to be jealous of; to be envious of; to envy

to give; to confer; to bestow; to kindly do for one; to oblige; to favour; to favor