A friend and I got an Americano, a tea, and some sweet potato fries with powdered sugar. The coffee was amazing, the tea came in an adorable little pot and the fries... oh my goodness, can you say ah-mazing. They came with a dollop of whipped cream and strawberries on the side and I think my heart now has a separate compartment for whipped cream, it was so good.
Check out Café Oui sometime - head to Garosu-gil (out of Sinsa station exit 8, walk straight and turn left onto Garosu-gil) and walk straight down until Coffee Kitchen, where you will turn left. Café Oui will be on your right - hint: watch out for Café Oui's lawn with patio chairs!