Coeur de Blé

I was trying to follow a french recipe for buckwheat pancakes and it mentions needing a coffee spoon of 'farine de ble coeur de blé'. I've been trying to find out what that is since I can't work out what 'wheat flour heart of wheat' is. A web search doesn't find anything and google translate just deals with the words and gives me 'wheat heart' back which doesn't help either.

I hope someone here can help.