Jiachien cooks a large dinner for her boyfriend Raymond, and talks about her good memories about learning cooking in the big kitchen and her conflicts with her father when she grows up. However, Raymond does not pay real attention to Jiachien and just keeps eating the food and makes fun of her story in the childhood (use the food to make a ring).
I think this part is important because of two reasons: 1. This is the first scene that the relationship between Jiachien and her father has been described out. 2. Shows the personality of Raymond and implies the end of the relationship of Jiachien and Raymond in the latter part of the film.