Authentically Brewed French Onion Soup with Beef Stock

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A classic French soup where onions are caramelized slowly over low heat for 45 minutes, then simmered with rich beef stock and a toasted baguette topping. This french-inspired soups ready in about 70 minutes pairs medium, thinly sliced yellow onions, beef stock, butter for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 280 calories and feeds 4, 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.

Prep: 25 min Cook: 45 min Serves 4 French cuisine 280 cal/serving
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Ingredients

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Instructions

  1. Step 1: Melt 3 tbsp butter in a heavy-bottomed pot over medium-low heat, add 6 medium thinly sliced yellow onions, and cook uncovered for 45 minutes, stirring occasionally until deeply caramelized and golden brown.
  2. Step 2: Sprinkle 1 tbsp all-purpose flour over onions and stir constantly for 2 minutes to form a paste, then slowly whisk in 3 cups beef stock until smooth.
  3. Step 3: Bring to a gentle simmer and cook uncovered for 20 minutes, allowing flavors to meld and the soup to thicken slightly.
  4. Step 4: Preheat oven broiler, then arrange 1 slice baguette cubes in a baking dish, top with 1/2 cup grated Gruyère cheese, and broil for 3-4 minutes until cheese is bubbly and golden.
  5. Step 5: Ladle hot soup into bowls, top with a cheese-topped baguette cube, and serve immediately.

Frequently asked questions

How long does Authentically Brewed French Onion Soup with Beef Stock take to make?

Total time is about 70 minutes (25 min prep + 45 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 Authentically Brewed French Onion Soup with Beef Stock?

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 beef stock from drying out.

Can I substitute ingredients in Authentically Brewed French Onion Soup with Beef Stock?

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 Authentically Brewed French Onion Soup with Beef Stock for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). 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 Authentically Brewed French Onion Soup with Beef Stock?

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.

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