Name: Bean and Cheese PupusasBrand: Casa SanchezOrigin: South San FranciscoFound at: Andronicos (1200 Irving at 14th Ave.)Cost: $4.99Ingredients: Corn flour, pinto beans, jack cheese, canola oil, onions, cumin, paprika.Calories per serving: 174 The word: Originally an invention from El Salvador some 3,000 years ago, pupusas are now a regular presence on these shores. They're sometimes mistaken for Mexican creations. Tasting notes: Yummy and definitely filling, if a bit dry. They're better wh