The chile relleno is a dish in Mexican cuisine that originated in the city of Puebla. In 1858, it was described as a "green chile pepper stuffed with minced meat and coated with eggs".
The most common pepper used is Puebla's poblano pepper, though New Mexico chile, pasilla, or even jalapeño peppers are popular as well. It is typically stuffed with melted cheese, such as queso Chihuahua or queso Oaxaca or with picadillo meat made of diced pork, raisins and nuts, seasoned with canella; covered in an egg white batter, simply corn masa flour and fried, or without any batter at all. Although it is often served in a tomato sauce, the sauces can vary.