People pay attention to the appearance of a dish; hence, considering the component of dishes and discussing the relationship between the feelings inspired by dishes and their images are interesting research topics. We exposed 50 participants to pictures of 66 types of hamburgers from three hamburger chains and conducted a sensory evaluation. Analysis based on the decision tree was applied to the sensory evaluation results, and we validated the characteristics of hamburgers. In summary, the participants tend to feel that the deliciousness and gorgeousness of hamburgers are primarily defined by whether the color of the hamburger is different from green and red. Sliced vegetables appear to have a larger volume; thus, the presence of sliced onion, lettuce, and cabbage may make them appear healthier. Further, we verified the adequacy of the decision tree. The decision tree represents (at most) only 50% of the explanatory power. However, the decision tree will be a sufficient structure if more sufficient explanatory variables are prepared.
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