Hello. You did not enter the text to which this question refers, which makes it impossible for it to be answered. However, and I will try to help you in the best possible way.
The tone of a text is the feeling you can get from reading. This tone is caused by the author of the text, who wants the reader to feel the same thing that the characters or the narrator are feeling in the scene being read. It is only possible to know how the tone affects the story to which your question refers, by reading the text. However, as we can see that it is a text where the narrator keeps the names of foods in Spanish, we can consider that the author wants to convey a feeling of pride and identification with the Spanish culture and ancestry that the narrator has.