An unhinged man stabbed his ex-girlfriend at the Brooklyn restaurant where she works — after breaking the front door with a chair to get inside, police said.

Rakien Figueroa, 42, allegedly hurled a chair at Mediterranean eatery CAVA on Adams Street near Fulton Street and barged inside around 7:50 a.m. Tuesday, authorities said.

He then repeatedly stabbed the 39-year-old woman, an employee, with a knife, police said.

She was taken to a local hospital, where she was listed in stable condition.

The NYPD released photos of Figueroa late Tuesday and said he is still being sought.