Onion soup recipe

Now that we have a big family I tend to buy things in bulk.  As much as it can be considered "bulk" in a London supermarket.  

So what do you do for diner when you have several kilos of pink onions in a cupboard and nothing much else as far as fresh vegetables?  Onion soup.

In France it is a classic hang-over cure served for breakfast when the party is winding down.  

Here it was adapted from the traditonal clear broth recipe, with a roux start to give it body (and an optional glug of wine).