Bánh mí is a Vietnamese sandwich. The main protein is typically pork, which is topped with pickled daikon radish and carrots, sliced fresh chiles, cilantro, and seasonings like chile sauce and fish sauce.
In a medium saucepan, combine milk and brown sugar; bring to a boil over medium-high heat, whisking constantly. Reduce heat, and simmer for 8 minutes, whisking constantly. Remove from heat; whisk in butter and vanilla. Let cool for 5 minutes.