NEW YORK - For seven years, Prince Street Pizza has been drawing crowds for their specialty: the Spicy Spring Square Pepperoni Slice.

"You get fresh mozzarella, you lay about six to eight slices on it, then you put a fra diavolo sauce on top of it, with a special cut Italian cut pepperoni, a little bit of parmesan cheese, pop that bad boy in the oven, come out, and you enjoy," said Prince Street Pizza Manager Dominic Morano.

That slice has led to a heated situation. Folks at Prince Street claim their former pizza baker has moved on to a  pizzeria on the Upper West Side, and took their spicy pepperoni recipe with him calling it the Spicy Pepperoni. Owner Frank Marano is pursuing legal action.

NY1 talked with his son Dominic, who is all fired up. 

"It is what it is at this point. They want to say what they want to say. We're going to say what we want to say, and it's going to get settled one way or the other," Morano said.

The slice in question is the Spicy Spring Square Pepperoni Slice. 

NY1 headed up to the Upper West Side to Made in New York Pizza, where former Prince Street pizzaiolo Frank Badali opened shop. His business partner Eytan Sugarmen calls the recipe Badali's creation — not the Prince Street pizzeria's — and that anyway, it's been tweaked. 

"They do have several distinctions from what it used to be to what it is now," Sugarmen said.

The slices at each place are priced at $4.50. Eytan Sugarmen says he is not sure why Prince Street is simmering over the similiar slice and that there's enough room in the pizza market for both shops. 

"There are no intellectual property rights for recipes, I think this whole thing is ridiculous, and pizza is such a fun happy thing, I don't know why we are delving into anything negative," Sugarmen said.

One thing the owners of both pizzerias can agree on: They're gonna sell a lot of these slices from the publicity over their feud.