At Barrio in Tremont, customization is the name of the game. Diners order with a pencil and paper, which are much needed given the infinite amount of combinations. It might be hard choosing between dozens of locally sourced protein, cheese and salsa options, but at the end of it all you can reward yourself with and icy margarita, sangria or house cocktail (especially if it's during happy hour, which is likely). This spot has a great patio outside, but the Day of the Dead-style decor and wallpaper (Skeleton. Mariachi. Band.) inside isn't something to miss out on.