All About Shake Shack's Secret Menu: Peanut Butter & Bacon!

Shares of Shake Shack Inc SHAK on Friday closed at $45.90 -- up 118 percent ($24.90) -- after one of the most-talked about IPOs of the year.

Shake Shack started in 2001 as a hot dog cart, managed by restaurant entrepreneur Danny Meyer. Over the past 12 months, the company has retrieved more than $100 million in revenues and net income of more than $4.5 million.

Its market cap now stands around $1.63 billion, larger than Red Robin Gourmet Burgers, Inc. RRGB and Noodles & Co NDLS, and about the same size as Sonic Corporation SONC. All three stocks were down on Friday.

How will Shake Shack drive revenue growth going forward? A look at its secret menu might provide a partial answer.

Many of the main fast-food chains have a secret list of items, outside the known menu, that customers can request, like Burger King Worldwide Inc’s BKW “Frings,” a mix of French fries and onion rings, or McDonald's Corporation’s MCD “Coke float,” a glass of Coca-Cola mixed with vanilla soft serve.

Photo: @lizchilders1

In Shake Shack’s case, the secret menu includes grilled cheese made with buns instead of bread, and a Peanut Butter Bacon Burger (depicted above). Will you soon try one?