Big burritos have become big business, the stuff of nationwide chains and wild IPOs. Today you can get your burrito filled with pork from hand-fed pigs and guaranteed-gasless beans, topped with your choice of six exotic salsas and soy sour cream. When a simple burro becomes that complicated, though, it's time to get back to basics. And there's nothing more basic than La Casa de Manual, the second incarnation of a modest Mexican eatery that's been serving Denverites for three generations. Order your wet burrito with beans, order it with beef or order it with both; you'll get a toothsome tortilla folded around refried beans so good that you don't care if you get gas, or tender shredded cow, or both, smothered in a very thin green chile studded with pork. When we say this burrito is the best, we're not kidding: We love it so much that we're willing to forgive Manual's lack of a liquor license.