He’s making gravy.

Five years ago, PJ Monte started bottling, hand-labeling and selling his family’s red sauce around local restaurants and specialty stores, earning him the moniker “Sauce Boss.”

Now, he’s really cooking. Monte’s Fine Foods Family Recipe Tomato Sauce is available in hundreds of retailers nationwide, and Monte is promoting himself by cruising around the city in a chauffeured, 90s-era white stretch limousine and selling his famous sauce from the trunk.

“I was always a hustler,” Monte told The Post, from the blue velvet back seat of the vintage limo, which he purchased last month for $15,000 in New Jersey and outfitted with a red neon sign reading “Monte’s.”

“My family’s been making sauce the same way for 120 years. I started posting cooking and sauce videos and peopl

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