Final answer:
Malú's favorite food during autumn cannot be determined based on the provided information.
Step-by-step explanation:
Based on the information provided, it is not possible to determine Malú's favorite food during autumn. The passage discusses a dearth, or scarcity, of grain during a particular period of time, which affected the quality of bread and resulted in hunger for many people.
However, the passage does not mention specific foods or preferences of individuals. Therefore, we cannot accurately answer the question about Malú's favorite food during autumn based on the given information.