French onion soup

Slow-cooker special to make a French classic. The original recipe I used (available here) doesn't require caramelising the onions. However, I think it would be that much better (and it was excellent when we made it in the winter) if you do take the extra effort to caramelise them. Here's my adaptation of a French classic.

Will serve lots. Recipe designed for a 5.7-litre slow cooker:

1.5 kg onions, thinly sliced (use a mandolin if you have one)
100g butter for frying
2 tbsp sugar
6 sprigs fresh thyme
1 bay leaf
1.5-2 l beef stock
1/2 cup sherry (or use wine vinegar)

Salt and pepper to taste

Baguette, sliced lengthwise

2 cups grated cheese (Gruyère or something similar)

Caramelise the onions in a big pan or two for about 30-45 minutes. To do this, slice the onions into rings or half-rings. Put a big pan on a medium heat with butter, thyme and bay leaves, then leave to cook, occasionally stirring. After 10 minutes, add the sugar and sprinkle salt over the top. (This step can also be done directly in the slow cooker, in which case at everything at the start and leave the onions ot cook for 6-8 hours, stirring occasionally).

Next, move everything into a slow cooker. Add the onion mix, stock and sherry, season with salt and pepper, cook for an additional 2-3 hours, stirring occasionally. At the end, discard the bay leaves and thyme. 

Switch on the grill in the oven. Put the baguette under the grill and cook for 1-2 minutes either side. 

Dish up some soup into an oven-proof bowl, top with a baguette slice or two, then top the bread with cheese. Put back into the oven and grill for around 2 minutes until the cheese has melted and is cooked.