I love this truck. Just chowed down on tacos al pastor with salsa roja (the "hot" option, but some days he also has salsa ranchero which is hotter), and horchata - lots of cinnamon. The owner told me to be sure to come by tomorrow, because he's going to have "a whole lot of specials" for an early Cinco de Mayo feast. He's going to have lengua tacos! (tongue)
For those who are having trouble finding Tacos Don Memo, go to 38th and Sansom, west side of the street (7-11 side), where all the college kids are sitting on the parking lot incline and salivating. I know exactly where it is, and twice now from half a block away I've thought it wasn't there even though it was. It's a really small truck, very shiny and new looking, and is parked behind (north of) KoJa at 38th and Walnut (Korean/Japanese truck, larger, has flag logos, also recommended). There are currently no signs or logos on the truck; the only place the name appears is on the menu.