A man adds barbecue sauce to ribs and sausages during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

Ribs are roasted during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

A barbequer adds a thick coating of barbecue sauce to ribs during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

A barbequer adds a thick coating of barbecue sauce to ribs during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

Barbequers work on ribs during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

A barbequer adds a thick coating of barbecue sauce to ribs during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

A barbequer works on ribs during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

A barbequer works on ribs during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)

People line up to buy barbecues during the 2018 Toronto Ribfest in Toronto, Canada, June 29, 2018. The four-day annual event kicked off on Friday to draw thousands of eaters. (Xinhua/Zou Zheng)