Meatless hamburgers have arrived in Argentina, following the growing world tendency of veganism, which has had an impact on the traditional fast (junk) food chains. In Buenos Aires, the Mostaza chain has launched its Mega NotBurger line, in alliance with Notco a start-up and recent Argentine unicorn, which elaborates food and proteins out of plants. Market surveys indicate that in Argentina there is a strong vegan or vegetarian percentage of the population, 12% and growing, points out Kantar Worldpanel. Likewise,…