A worker of a food company named Saikoh makes mooncakes with salted egg yolks in Yokohama, Japan on Sept. 30, 2020. This year's Mid-Autumn Festival falls on Oct. 1. (Xinhua/Du Xiaoyi)

A worker of a food company named Saikoh makes mooncakes with salted egg yolks in Yokohama, Japan on Sept. 30, 2020. This year's Mid-Autumn Festival falls on Oct. 1. (Xinhua/Du Xiaoyi)

A worker of a food company named Saikoh makes mooncakes with salted egg yolks in Yokohama, Japan on Sept. 30, 2020. This year's Mid-Autumn Festival falls on Oct. 1. (Xinhua/Du Xiaoyi)

Newly baked mooncakes with salted egg yolks are seen at a food company named Saikoh in Yokohama, Japan on Sept. 30, 2020. This year's Mid-Autumn Festival falls on Oct. 1. (Xinhua/Du Xiaoyi)

Mooncake with salted egg yolk is seen at Saikoh-shinkan, a restaurant of Saikoh food group in Yokohama, Japan on Sept. 30, 2020. This year's Mid-Autumn Festival falls on Oct. 1. (Xinhua/Du Xiaoyi)