Louis' Lunch is a petite eatery on Crown Street in New Haven, Connecticut, with a very big claim to fame. Louis Lassen opened his first luncheonette in New Haven in 1895, and, according to lore, he made fast food history in 1900 when a customer who was in a hurry asked for a meal he could take "to go." Thinking on his feet, Lassen slapped a broiled beef patty between two slices of bread, inventing the hamburger.