A Hokkaido fast food joint began offering whale burgers Thursday as antiwhaling nations urged Japan to cut back on its catch at an international whaling conference.

Restaurant chain Lucky Pierrot serves a deep-fried minke whale meat burger, served with lettuce and mayonnaise, for 380 yen at its 10 joints in Hakodate.

Japan is facing mounting criticism over its research whaling program, which sees whales killed for study purposes before their meat is then sold. Critics say this is commercial hunting in disguise.