Harissa-Spiced Lentil Soup with Caramelized Onions and Fresh Parsley

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

A warming lentil soup infused with smoky harissa and sweet caramelized onions, garnished with bright fresh parsley. This mediterranean-inspired vegan (vegetarian) ready in about 60 minutes pairs rinsed green lentils, olive oil, large, thinly sliced yellow onion for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 280 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.

Prep: 10 min Cook: 50 min Serves 6 Mediterranean cuisine 280 cal/serving
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Ingredients

Instructions

  1. Step 1: Heat 2 tbsp olive oil in a large pot over medium heat. Add 2 thinly sliced large onions and cook slowly for 15-20 minutes, stirring often until deeply caramelized and golden brown.
  2. Step 2: Add 3 minced garlic cloves, 1 diced large carrot, and 1 diced celery stalk to the pot. Sauté for 5 minutes until softened and fragrant.
  3. Step 3: Stir in 1 tbsp harissa paste, 1 tsp ground cumin, and 1 1/2 tsp salt. Cook for 1 minute until spices are aromatic.
  4. Step 4: Add 1 cup rinsed green lentils and 6 cups vegetable broth. Bring to a boil, then reduce heat to low and simmer uncovered for 30-35 minutes until lentils are tender.
  5. Step 5: Season soup with 3/4 tsp black pepper. Ladle into bowls and garnish with 1/4 cup chopped fresh parsley and lemon wedges for squeezing.

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Frequently asked questions

How long does Harissa-Spiced Lentil Soup with Caramelized Onions and Fresh Parsley take to make?

Total time is about 60 minutes (10 min prep + 50 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 Harissa-Spiced Lentil Soup with Caramelized Onions and Fresh Parsley?

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 rinsed green lentils from drying out.

Can I substitute ingredients in Harissa-Spiced Lentil Soup with Caramelized Onions and Fresh Parsley?

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 Harissa-Spiced Lentil Soup with Caramelized Onions and Fresh Parsley 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.

Is Harissa-Spiced Lentil Soup with Caramelized Onions and Fresh Parsley 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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