Watercress and Lemon Soup

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

A bright, refreshing soup featuring peppery watercress, zesty lemon, and a light broth, ideal for spring or as a palate cleanser. This french-inspired soups ready in about 30 minutes pairs butter, onion, carrot for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 190 calories and feeds 2, 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: 20 min Serves 2 French cuisine 190 cal/serving
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Ingredients

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Instructions

  1. Step 1: Melt 2 tbsp butter in a pot over medium heat.
  2. Step 2: Add 1 onion (diced) and cook for 5 minutes until translucent.
  3. Step 3: Stir in 2 carrots (diced) and cook for 3 minutes to soften slightly.
  4. Step 4: Add 1 cup watercress (chopped) and 2 cups vegetable broth, bringing to a simmer.
  5. Step 5: Cook uncovered for 15 minutes until carrots are tender.
  6. Step 6: Stir in 1 lemon (juiced) and season with salt and black pepper to taste, adjusting as needed.

Frequently asked questions

How long does Watercress and Lemon Soup take to make?

Total time is about 30 minutes (10 min prep + 20 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 Watercress and Lemon Soup?

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 butter from drying out.

Can I substitute ingredients in Watercress and Lemon Soup?

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 Watercress and Lemon Soup for a different number of people?

The recipe is written for 2 servings. Multiply each ingredient by (your serving target / 2). 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 Watercress and Lemon Soup?

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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