Mancini's Pizza is a pizzeria that appears in the first Panini comic, Takeout.
In Takeout, Mikey dons a disguise and buys a stack of ten pizzas. Through a series of unfortunate events, the Turtles have to juggle the pizzas around in order to take care of different emergencies. After all of the hurdles they went through, a semi truck runs down the pizzas, destroying them.
When they return home, the Turtles explain everything to Splinter and he hands an "ancient scroll" to Leonardo to use next time to prevent this from happening again. This "scroll" turns out to be a takeout menu for Mancini's.