CHICAGO (CBS) — Happy Birthday Portillo’s!

In honor of the local chain’s 54th birthday, Potillo’s is selling Thursday, April 6, 54-cent slices of its famous chocolate cake.

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The local chain began as a hotdog stand called “Dog House” in 1963 in suburban Villa Park. Portillo’s has since grown to have 47 restaurants across the county, with two locations in Chicago – one in River North and one in the South Loop, on Canal and Taylor.

“We would not be here without two important ingredients – our founder, Dick Portillo, and our devoted fans across the United States,” said CEO Keith Kinsey, in a statement. “The Portillo’s team looks forward to celebrating this milestone with our customers.”

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The special ’54th Portillo’s Birthday’ offer is available at all locations on Thursday, April 6. The offer is while supplies last and limits one slice per customer. A slice of Portillo’s chocolate cake normally costs $3.09.

Portillo’s also reminds its customers that they can receive a FREE slice of the famous chocolate cake on their birthday by visiting,

Click here to find the nearest Portillo’s location.

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And if one slice is not enough or you do not live in an area with a Portillo’s, you can have an entire famous chocolate cake delivered to you.