I went into this new specialty coffee shop today, they had a nice place and very informative brochures about the coffee beans they were using that day, happened to be a top quality Brazilian product whose the beans looked nicely roasted, the barista showed expertise in preparing my espresso and answered all my questions with patience. I was savoring my coffee even before it was served, but it was a big disappointment, the brew was extremely acidic (we are talking lemon-juice acid here) and with a such a rough texture that dulled my tongue to other flavors. I did not enjoy my coffee at all. I complained to the barista about the acidity (as we had discussed acidity and he assured me that the coffee was not acidic at all) and he offered to prepare a new coffee with the same result. My question is, given that Brazilian coffee beans are probably the least acidic ones, what could have gone wrong with the brewing to yield such awful tasting product ?