I finally made it to El Guaton in Woodside for a chacarero sandwich and it was pretty damn good. It didn't look as big as I'd thought it would be but it's heft kind of crept up on me on the ride home. It had everything you could want in a sandwich with the creaminess of the advocado puree and mayo contrasting with the crunchy green beans and wheaty oversized roll. The beef was nicely flavored and tender as well.
I didn' t care much for the empanada de pollo though. It was a bit too herby and the various fillings just didn't come together in any form of unified deliciousness.
The owner was really nice and helpful too which made ordering a lot easier.
Down the street at Ira Panaderia Y Confiteria, a Uruguyan and Paraguayan bakery I sampled an alfajor de mazeina con dulce de leche, which was a little too dry but the other items looked promising and I liked the general feel of the place.