This is the 27th most frequent French word.
en
"En" is a French pronoun meaning "of it," "of them," or "some."
Here, 'en' indicates a time expression referring to the season 'été' (summer), demonstrating a temporal context.
J'y vais souvent en été.
I often go there in the summer.
In this sentence, 'en' introduces a focus or emphasis within a specific aspect of the subject, serving a restrictive usage.
Je m'intéresse à la cuisine, en particulier aux desserts.
I am interested in cooking, especially in desserts.
Here, 'en' is used to express the duration of time within which the action of finishing the work took place.