The Milwaukee butter burger is a fresh-griddled beef patty with a generous pat of butter melted on top, served on a toasted bun with stewed onions.

Kenneth Salmon, known as Solly, opened Solly's Coffee Shop in 1936 near Green Bay and Burleigh, and the shop popularised the butter burger, a pat of butter on a fresh-griddled patty with stewed onions; the diner moved to North Port Washington Road in Glendale in 1971. The style spread to Sobelman's, Kopp's and other Milwaukee chains, and the term butter burger entered the Milwaukee lexicon by the 1950s. Solly's still serves the original version with the butter visible on the patty as you eat it; Sobelman's adds toppings; Kopp's pairs it with daily-changing frozen custard.

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