This is a complicated subject, but very generally speaking, you use à when the item is just one component (tarte aux pommes) and de when it's made primarily of that ingredient (confiture de fraises). Take a look at à vs de for more.
Bonjour Jean !Here is the link to our related lesson:https://french.kwiziq.com/revision/grammar/compound-nouns-are-formed-using-prepositions-a-de-en
Bonne journée !
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