Bonjour
<em>If you meant complete with the correct article, it's DES, indefinite article plural</em>
Il va acheter des éclairs.
<em>If you really meant a correct possible adjective, you still have to add an indefinite plural articles which is "DES" which becomes "DE" , partitive article</em>
Il va acheter de bons éclairs.
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hope this helps ☺☺☺
I would say sort of think about what the foods are and what time of day you would have them. For example you would most likely have oysters (des huîtres) in the evening. Hope this has helped a bit!