Answer:
Roach's purpose behind writing "THE YUCKIEST FOOD IN THE AMAZON" is to convey how strongly she dislikes that food, Her tone, the capitalization of every letter, really show how passionatly she doesnt like that Amazon food.
Hope this helped you :)
Sorry if it didnt :/
Let me know if i misunderstoop question cause I'll keep working on it if so.
Good luck :))
