In 2013, Boulder got a first taste of Snarfburger — the burger-centric offshoot of local franchise Snarf’s Sandwiches — when Snarfburger’s flagship location opened on Arapahoe Avenue. Now, Denver is getting a double-dose of Jimmy “Snarf” Seidel’s foray into the burger world with two new Snarfburger locations. A Snarfburger quietly opened in late July at 2535 Federal Blvd., next door to Snarf’s Sandwiches, and a second Snarfburger is slated to open later this summer at 1001 E.