The taco, one of Mexico's best-known dishes, took an unusual route to Japan, arriving in the form of Tex-Mex food -- Mexican cuisine influenced by Texan tastes -- in Okinawa during the U.S. occupation. Tex-Mex-style tacos are often made with wheat-flour tortillas and filled with ground beef, tomatoes, and cheese. Restaurants serving Tex-Mex tacos started emerging in Tokyo in the 1980s, and this style remained the mainstream in Japan for nearly 40 years, according to Koichiro Yoshikawa, a self-described "taco navigator" who does Mexican cuisine food tours and runs the Tacos Mercado restaurant in Tokyo. More recently, the soft, flavorful corn tortillas found in Mexico have been gaining ground, with simply seasoned toppings that bring out the taste of the ingredients.