The secret is perfectly caramelized onions. Some chefs short cut this process by adding sugar or honey to their onions, it gets results but not as good as this. Slow and steady wins the race and makes for natural sweetness that pairs perfectly with rich beef stock and wine.
Ingredients
6 Cups thinly sliced onions
3 Tablespoons unsalted butter
2 Tablespoons olive oil
1 Tablespoon fresh thyme, chopped
1/2 Cup white wine or sherry
4 Cups Beef Stock
French bread
Gruyere cheese
Salt and pepper to taste
It all starts with onions..LOTS of onions.
In a large pot melt butter and olive oil on low heat until butter begins to foam. By adding olive oil to the butter it will increase the smoke point (temperature at which fat begins smokes) Butter is normally very low and quick to brown but we want to maintain the richness of the butter and avoid browning it. By using the added olive oil it works like an insurance policy.
Add all your onions to the pot and coat in fat. It will be almost to the top it they will shrink down as the first steam and then like magic they will begins brown. This whole process can take about an hour on low heat.
About 5 mins later you will see them start to steam and soften.
Once onions are reduced by about half the volume. Sprinkle in thyme and a little salt and pepper. Toss to coat.
The onions will start to be really soft an stringy like, and will start getting almost sticky.
Once you start to get sticky you will stir and see a little caramel colored film on the bottom of the pan. This is called the fond, and its like a powerhouse of flavor, so we want to use it as a building block to add depth to our soup. Just keep stirring an scraping every couple minutes.
They will start to get light brown bits through out the onions.
Then it will start getting an even layer of caramelizing on the bottom so keep stirring an scraping the bottom of your pot until deep golden brown. Be careful not to burn it.
Just like this! You can put these on anything from omelets to pizza, even over a block of Brie!
Add white wine or brandy to the pan and deglaze.
Make sure to get all that great fond off the bottom of the pan.
Pour in beef stock and put a lid on top and let simmer for at least a half an hour. The longer it cooks the better it gets.
Once it has simmered it will look like this. You could totally eat it just like this... But we're going to make it even better.
Slice some thick rounds of french baguette. Brush with olive oil and sprinkle with salt and pepper on both sides. Broil and flip till both sides are crispy and golden.
Ladle soup into a oven safe ramekin. Float a toasted baguette piece in soup and lay as much Gruyere on top as you like.
Place under broiler until cheese is melted into soup and golden brown.
Remove from broiler and let cool just a bit and then dig in! Its creamy, sweet, and like a savory bread pudding almost. Serve this with a crisp cool simple green salad and dinner is ready.
Happy Cooking!