Rosa's Pizzeria in Philadelphia charges $1 a slice – and $1 more to buy a slice for someone in need

In the deepest, darkest depths of January, this is sure to warm your soul.

 

Rosa’s Pizzeria in Philadelphia, is a $1-a-slice shop. Sounds good, right? Well, it gets better.

 

The no-frills shop has served 8,500 slices of pizza to homeless people through a “pay it forward” act of kindness.

 

The idea, which involves someone receiving an act of kindness and passing it on, is nothing new but owner Mason Wartman now serves a paper plate of pizza to about 40 people in need every day.

 

How does it work? Each slice costs a dollar but for one more dollar, you can buy an extra piece of pizza for someone else – dubbed “paying it forward.”

 

In March 2014, a customer asked to pay for a slice for the next homeless person who came in. Wartman, who used to work on Wall Street in New York, wrote it down on a Post-it note to keep track. The walls are now covered in the pink, blue and yellow sticky notes.

 

He told ABC: "This guy wrote on a paper plate: “God bless you. Because of you I ate off this plate the only thing I ate all day.”

 

Consider those cockles well and truly warmed.