Louis' Lunch onion, then served on two square pieces of toasted white bread. Louis' Lunch flame broils the hamburgers in the original cast iron vertical gas broilers manufactured by the Bridge and Beach, Co., St. Louis, Missouri in 1898. The stoves use hinged steel wire gridirons to hold the hamburgers in place while they cook simultaneously on both sides. The gridirons were made by Luigi Pieragostini and patented in 1938. A sharp cheese spread is used, as opposed to sliced cheese. The restaurant uses a 1929 Savory Radiant Gas Toaster. The restaurant is traditionally closed during the month of August (for annual
Ploughman series Ploughman series The Ploughman series was a series of Irish banknotes issued by the Currency Commission of Ireland as a transitional measure for eight Irish banks: Bank of Ireland, Hibernian Bank, Munster & Leinster Bank, National Bank, Northern Bank, Provincial Bank of Ireland, Royal Bank of Ireland and Ulster Bank. They were initially issued between 6 May and 10 June 1929 as part of an arrangement to get the banks to withdraw their previous individual banknote issues. As part of the arrangement the banks would refrain from issuing their own notes in future. The commission instead issued their collective notes.