It happened in Syosset on Sunday, April 7, according to Nassau County Police.
At approximately 3:40 a.m. that morning, a burglar forced their way through the back door of Italian-American restaurant Café Testarossa, located at 499 Jericho Turnpike.
Once inside, authorities said the thief stole a total of $8,000 cash from the register before fleeing the scene.
There are no descriptions of the subject and the investigation is ongoing.
Anyone who may have information regarding the incident is encouraged to contact the Nassau County Crime Stoppers at 1-800-244-TIPS or call 911.
All calls will remain anonymous.
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