The story
From the Mission neighbourhood of San Francisco, where the Mission burrito was first developed.
Etymology from Wiktionary, CC BY-SA 4.0.
Mission burrito
Today it means: A dish in American cuisine usually consisting of a tortilla wrapped around meat, rice, beans, sour cream, as well as various vegetables and sauces. The Mission burrito is distinguished from a traditional burrito by its larger size and greater diversity of ingredients and is the most common variety of burrito consumed at a typical "burrito restaurant". Full definition →