"Overlord meal" sweet oil is fermented by shading and high temperature in the spring of each year. When the dough produces milk yellow bacteria like velveteen, it is moved out of the room, dried in a ventilated place, and put into an open-air VAT to soak with water. Sun exposure during the day, moonlight at night and morning dew. After the beginning of autumn, the apricot yellow liquid taken out from the cylinder is called sweet oil. Sweet soy sauce is rich in flavor, clear in color, delicious and refreshing, and has a strong body, which integrates fresh, sweet, strong and fragrant. It is a must-have cuisine for Suqian local families.