People loiter outside El Norteño, the humble Mexican-food shack at the corner of Seventh Avenue and Roosevelt Street. Are they waiting to order? Have they already ordered? Is this where the line starts, sir? Eventually, you piece together that you must enter a small vestibule (only one person at a time, especially these days) to place your order. On the wall inside is a massive menu that vaguely resembles the periodic table of the elements. You could eat here twice a week for a year and still not try everything. So, we'll make it simple for you: Go with the chorizo egg burro, and add potatoes. It's about $6 with tax, and, depending on how you see your day going, constitutes either a big breakfast or two small ones. Join the loiterers. When your order's called, apply the spicy salsa that comes in little tubs in your brown bag to every bite. And remember to bring bills — El Norteño is cash only, and closed on Sundays.