Philadelphia is the home of many culinary institutions, both gourmet and local staples. The city's immigrant history has allowed many tastes to mix and develop. The cheesesteak, created in Philadelphia in the 1930s, is a well known city icon. A popular Philadelphia argument is which of two cheesesteak rivals has the best steaks, Pat's Steaks, which invented the cheesesteak, and Geno's Steaks. Italian ice (often referred to exclusively as ""water ice"" in the Philadelphia area) and soft pretzels were not invented in Philadelphia, but because of their popularity and availability have become Philadelphia staples. Irish potato candy is a popular Philadelphia confection that is especially popular around St. Patrick's Day.