Caramelized Onion and Leek Soup with Crispy Garlic

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A deeply savory soup where onions and leeks caramelize slowly, balanced by a touch of garlic crunch for texture. This french-inspired soups (vegetarian) ready in about 70 minutes pairs medium onion, large leek, garlic for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 310 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 310 cal/serving
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Ingredients

Instructions

  1. Step 1: Thinly slice onions and leeks (white parts only), then melt 2 tablespoons butter in a pot over medium heat. Add onions and leeks, stirring occasionally, and cook for 25 minutes until deeply golden and caramelized.
  2. Step 2: Add 4 cloves minced garlic and cook for 1 minute until fragrant. Sprinkle in 2 tablespoons all-purpose flour, stirring constantly for 2 minutes to form a roux.
  3. Step 3: Gradually whisk in 4 cups chicken stock, then add 1/2 teaspoon salt and 1 teaspoon fresh thyme. Simmer uncovered for 15 minutes, then stir in 1/2 cup heavy cream and cook for 5 more minutes until slightly thickened.

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Frequently asked questions

How long does Caramelized Onion and Leek Soup with Crispy Garlic 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 Caramelized Onion and Leek Soup with Crispy Garlic?

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 medium onion from drying out.

Can I substitute ingredients in Caramelized Onion and Leek Soup with Crispy Garlic?

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 Caramelized Onion and Leek Soup with Crispy Garlic 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.

Is Caramelized Onion and Leek Soup with Crispy Garlic vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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