Depending on the fruit you use for making it there are many different jams. The ingredient is one of many possible jams >> a jam.
no, you can't put A or ONE jam in a cake, sandwich etc.
why would you put A JAM as an ingredient?
It is VERY wrong to say A jam, because the noun "jam" is uncountable. ❤❤❤??
It should be allowed to say l'ingrediente è marmellata
i put l'elemento instead of l'ingrediente -- shouldnt it still be right