The first Mission burrito was made either at El Faro taqueria in San Francisco's Mission District on September 26, 1961 or at La Cumbre taqueria on September 29, 1969. The burrito is quite large and consists of a big, press-steamed tortilla that is usually filled with baked beans, rice, sour cream, guacamole, salsa, shredded lettuce, and jalapeños.