Slow-Simmered French Onion Soup with Crusty Baguette
A deeply flavorful soup where onions are slowly caramelized to unlock natural sweetness, served with a toasted baguette slice for dipping. This french-inspired soups ready in about 115 minutes pairs pounds yellow onions, tablespoons unsalted butter, tablespoon all-purpose flour for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 420 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 2 pounds yellow onions
- 3 tablespoons unsalted butter
- 1 tablespoon all-purpose flour
- 4 cups beef broth
- 1/2 cup dry white wine
- 1 loaf baguette
- 1/2 cup Gruyère cheese
Instructions
- Step 1: Peel and thinly slice 2 pounds yellow onions into uniform 1/8-inch rings. Melt 3 tablespoons unsalted butter in a heavy pot over medium-low heat, add onions, and sprinkle with 1 teaspoon salt. Cook for 45 minutes, stirring every 10 minutes with a wooden spoon until deeply golden and caramelized, not browned.
- Step 2: Stir in 1 tablespoon all-purpose flour and cook for 2 minutes until bubbly. Carefully pour in 1/2 cup dry white wine, scraping up any browned bits, and simmer for 3 minutes until reduced by half.
- Step 3: Add 4 cups beef broth, bring to a gentle simmer, and cook uncovered for 20 minutes to meld flavors. Meanwhile, slice baguette into 1/2-inch thick slices, toast in a 350°F oven for 8 minutes until crisp. Top each bowl of soup with toasted baguette and 1/2 cup shredded Gruyère cheese, broil under high heat for 2 minutes until bubbly and golden.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Slow-Simmered French Onion Soup with Crusty Baguette take to make?
Total time is about 115 minutes (30 min prep + 85 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.
How do I store leftover Slow-Simmered French Onion Soup with Crusty Baguette?
Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep pounds yellow onions from drying out.
Can I substitute ingredients in Slow-Simmered French Onion Soup with Crusty Baguette?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Slow-Simmered French Onion Soup with Crusty Baguette for a different number of people?
The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Slow-Simmered French Onion Soup with Crusty Baguette?
French soups like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
What others are saying
- ★★★★★
Substituted chicken for tofu and it worked beautifully.
- ★★★★☆
Really good but took about 10 minutes longer than stated.
- ★★★★☆
Very good for a 85-minute recipe. Would bump up the spice level though.
