Mikasa - Mexico City - TravBuddy

Mikasa is actually a Japanese supermarket in La Roma Norte. During lunch hours on weekdays they have a sushi bar against the far wall of the market; on weekends they have an outdoor barbecue at lunch. The sushi bar is limited (and certain items -- say, anything involving tuna -- are maybe a little misleadingly labeled), but it's solid and also includes other freshly prepared (if not homemade) items like spring rolls, kimchi, and seaweed salad. (They also have the best inari sushi pockets in the city, as far as I can tell.) If the particular roll you're looking for isn't out on the table, just ask one of the many employees behind the refrigerator, it usually doesn't take more than 5 or 10 minutes for them to fill a small order.

Haven't tried the barbecue, so I can't speak to it. The supermarket is really well supplied with all sorts of Asian products, from fresh bean sprouts and lotus root to frozen edamame to fresh seafood to Ramen noodles. Prices are quite reasonable.