THEFREEN BURGER Taipei Zhongxiao Dunhua is a burger shop in Da'an District that serves vegan burgers and beef burgers. Its vegan options include a fried mushroom burger and a salsa sauce burger, while the spicy beef burger comes with jalapeños, and fries and a green lemon drink are also served. Food is made after ordering, and the space has one large table and a row of window seats. The beef patty is thin and on the dry side.