What is the joke about Degang Guo Yuqian's chef stealing the canteen?

A passage from kitchen 2. Yu Qian's father is a chef in a canteen. Every day when he comes home from work, he will take something home from the big stove for his family to eat. Kitchen, kitchen 2 has a section. The content of cross talk is: once during the Chinese New Year, I improved my food in the big kitchen and ate a lot of delicious food. Yu Qian's father took Yu Qian to the big kitchen to steal things, and Yu Qian wore a big cotton-padded coat to hide things in his clothes. The hot pot put in the cotton cap and tucked in the waistband was found by the guard at the gate and fought.