The great thing about burritos is that you can make them to your personal taste and fill them with whatever you like. Today, we are going to fill the burrito with a few of my favorites. We have a base of black beans, rice, some sautéed green pepper and red onion, grated Monterey jack cheese, a little bit of sour cream and some salsa. But again, the fillings are versatile, it is the assembly of the burrito itself that we are going to concentrate on. he first key to making a great burrito, and I can not stress this enough, it is critical, is using the right size tortilla. When you go to the store you will see that there are a number of different varieties of tortilla advertised as burrito sized. Always get the largest one, because when you go to add your fillings you want to make sure that there is enough room for everything. The 12 inch tortilla is a great size. This is a Mexican food.