This charming baked soup evokes a rustic French kitchen with its slow caramelized onions, and the kind of earthy, unapologetic rich aromas perfuming the hearthside. It feels “authentic,” a culinary story, a lineage.
Number of portions, 7 servings
Serving size ~350 g
Calories per serving ~445 kcal
Speed: Slow
Experienced cook (active time) 50–55 min
Novice cook (active time) 60–75 min
Total elapsed time 2–2.5 hours
4 oz fatty bacon cut into lardons
6 small onions (2lbs), thin sliced
1 to 2 sprigs thyme, minced
½ tsp salt
½ tsp pepper
⅓ cup white wine
3½ cups rich beef broth
8oz very thin slices of day-old/stale bread
7 to 8oz Parmesan cheese, sliced thin
¼ + cup cream
CROUTONS
2 slices of crusty bread (about 1 cup)
2 Tbsps butter
- Render the fat from the lardons in a saucepan over medium heat until they are evenly golden.
- Remove the rendered lardons and set aside.
- Drain all but 2 Tbsps. of the fat.
- Slowly cook the onion in the fat, until it turns a deep brown and is falling apart - all the sweetness of the onion will come out at this point. If using a cast iron or stainless steel pan (recommended), a 'fond' will start to develop as the sugars in the onion begin to caramelize and stick to the pan. Don't avoid this stage, but enter it joyfully - this is where your flavour will come from.
- Add the thyme, mixing it in.
- Season with the salt and pepper
- Stir in the wine and cook down for a few minutes.
- Add the broth. Scrape up all that wonderful fond and continue simmering for about 30 minutes.
- Pre-heat the oven to 350°F.
- In an oven-ready pot or earthenware casserole dish, make consecutive layers of:
- thinly sliced bread
- thinly sliced Parmesan
- 1 Tbsp of cream
- some of the bacon
- and repeat, continuing with another bread layer, until the casserole is half full.
- Last but not least, pour the onions and their stock over all this.
- Bake in the oven, covered, for 1 hour.
- Cube the bread to make croutons.
- Over medium heat melt the 2 Tbsps. of butter in a small pan (level of butter should be 1/4 inch) and allow it to heat up completely so that when a cube of bread is put in, it will quietly sizzle.
- Add the bread cubes and fry, stirring constantly so they brown evenly, about 30 seconds to 1 minutes.
- Burns easily!
- With a slotted spoon remove the croutons. You can use any leftover fat as the base of your next cooking project.
- When the casserole is baked, remove the dish from the oven, sprinkle the croutons on top and return to the oven to broil until the top is gently bubbling and the croutons nestled in.