BOULDER - Snarf's Sandwich Shop is branching into the burger and frozen-custard business.

Denver-based Snarf's LLC plans to open its first Snarf Burger with a menu of hamburgers, deep-fried hot dogs, deep-fried bologna sandwiches and frozen custard, said Jim Seidel, founder and chief executive of the sandwich chain. The new restaurant is slated to open Monday, April 15, at 2000 Arapahoe Ave. in Boulder.

Seidel plans to do business as Snarf Burger at the 351-square-foot location, since "Snarf" has better brand recognition than "Flippin' Burgers," the formal business name. A sign hanging on the outside of the building features the Flippin' Burgers logo - a burger with a face. The location formerly was the home of Daddy Bruce's Bar-B-Que restaurant.

Seidel said he plans to charge about $5.50 for a double cheeseburger and $3.50 for a "concrete," a frozen custard treat served in the style of the iconic Ted Drewes Frozen Custard in St. Louis. He jokes that he almost called the restaurant, "Fried."

"A fried bologna sandwich - it's the best," Seidel said. "The translation doesn't work quite right, but when you dig into it, you love it."

There's parking behind the building and on the street, Seidel said.

The original Snarf's location at 20th and Pearl streets in Boulder opened more than 16 years ago. That restaurant later moved to 2128 Pearl St., on the south side of the street. Snarf's has three other locations in Boulder County - one in Boulder and two in Longmont. The company also is close to signing at least two new leases in the Denver metro area, along with a new lease on a location in Austin, Texas, Seidel said. A Snarf's sandwich shop is open in Fort Collins, along with two in Chicago and two in St. Louis, and Seidel said he is looking for a third location there as well.

Snarf's last week announced plans to increase its current 15 restaurants to 50 locations by 2018. Seidel declined to disclose revenues of the privately held company.

Daddy Bruce's Bar-B-Que closed in March 2012. The building was bought by Zane Blackmer, owner of Rockrimmon Real Estate, for $225,000. Seidel said he will lease the property from Blackmer.