In Mexico, it's not uncommon to find burritos made with just refried beans and meat wrapped in a flour tortilla. But here in the US, they vary widely and are often loaded with ingredients like: Spanish or regular rice, lettuce, salsa, cheese, guacamole, sour cream, grilled onions, etc. Some even include French fries, like the 'mythical' California Burrito. I have to admit that rice (or Spanish rice) is the one ingredient that I avoid when ordering a burrito. To me it just seems like filler and distracts from the burrito's superstar ingredients, i.e., everything else! I may be in the minority on this since it's such a common component, so feel free to add it here. And if you're serving these to a group, it doesn't hurt to have rice available as a topping (I typically do).