Does anyone know the origin of jar soup? Help me find it. Thank you

Late Qing dynasty and early Republic of China! Pot soup began to spread. It turns out that this pot of soup was left by the landlord for the long-term workers. He ate mutton. He doesn't know the value of sheep viscera, but he feels it's a pity. He asked the chef to cook them and mix them with the soup he left for the long-term workers to eat! The long-term workers came back from work to eat this meal, and it was cold. Thanks to the chef, he thought of a way! Put the rice in a jar, wrap it up and keep it warm, and the long-term workers can have hot rice when they come back. This is the origin of jar soup!

10 years ago, Xie Ji jar soup could not enter Juye City at all, because the jar soup made by an old man named Laobaigan was delicious! He has been selling rice at the original tractor station. Unfortunately, the old man has no descendants, and his skills have not been passed on to future generations after his death. In the following years, Xie Ji jar soup mushroomed on the edge of Juye County, making this place famous!