The Occupy Wall Street volunteer kitchen staff launched a “counter” revolution yesterday — because they’re angry about working 18-hour days to provide food for “professional homeless” people and ex-cons masquerading as protesters.

For three days beginning tomorrow, the cooks will serve only brown rice and other spartan grub instead of the usual menu of organic chicken and vegetables, spaghetti bolognese, and roasted beet and sheep’s-milk-cheese salad.

They will also provide directions to local soup kitchens for the vagrants, criminals and other freeloaders who have been descending on Zuccotti Park in increasing numbers every day.

To show they mean business, the kitchen staff refused to serve any food for two hours yesterday in order to meet with organizers to air their grievances, sources said.

As the kitchen workers met with the “General Assembly’’ last night, about 300 demonstrators stormed from the park to Reade Street and Broadway, where they violently clashed with cops.