It seems to be delicious!
At each Lotteria store, "rice-jiuqu winning burgers" will be on sale from January 12, 2017 to mid-February, according to the season for entrance exams and coming-of-age ceremonies. The price is 380 yen (tax included) separately.
This is a burger with buns sandwiched between loin cutlet patties and cabbage with a diameter of about 12 cm, which has increased softness and umami by soaking in rice jiuqu. Based on Worcestershire sauce, apples, honey, golden sesame, and white sesame sauce with a strong aroma and taste are added. It seems to be a hearty dish.
During the same period, "Cheese Rice Jiuqu Winning Burger" with a rich cheese sauce that combines cheddar cheese, cream cheese, mozzarella cheese, and camembert cheese will also be on sale. The price is 420 yen (tax included).