The whole sentence is:

"C'est un gros fromage sous un fil chauffant, que l'on racle à tour de rôle dans nos assiettes pour en récupérer le fromage fondu."

I think that en is used to indicate de nos assiettes ("récupérer le fromage fondu de nos assiettes"). However, I still struggle with correct usage of en and y, so confirmation from someone more knowledgeable would be appreciated.

Remark: For this type of questions it would be helpful to cite the whole sentence. If you have not done the exercise (I had done it), you have to do the whole exercise, if you would like to see the context.