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What's the meaning of
Mushrooms it is? What is this grammar structure and inversion? Please include a grammar source and some more examples.
Arlene: would you like to go to a movie tonight?
Jim: I'd rather stay home and watch T.V.
Arlene: Sounds good. Maybe we could make dinner later.
Jim: I'd rather not cook tonight. Let's order out for some pizza. We haven't done that for a while.
Arlene: OK. Mushrooms or anchovies?
Jim: I'm in the mood for pepperoni. Let's get a pepperoni pizza.
Arlene: I'd rather not. Pepperoni gives me heartburn. I'd rather have mushrooms than pepperoni, if that’s OK with you.
Jim: Mushrooms it is! Now. What should we watch on TV? How about the new Stephen King thriller?