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Overview

Sopa de Agriao

Sopa de Agrião, Portuguese Watercress Soup

This sopa de agriao recipe is Portugal's light green watercress soup: potato, carrot and onion simmered in vegetable stock, blended smooth, then finished with fresh watercress and good olive oil. It is served with a swirl of cream, fresh watercress leaves and crunchy croutons. One serving is about 430 g.

Sopa de agrião is one of Portugal's oldest green soups, from a country where watercress grows wild along streams and in kitchen gardens. Like caldo verde, its better-known cousin from the Minho, it is a peasant soup built on potato, onion and olive oil — but where caldo verde uses shredded cabbage, this one uses peppery watercress, blended smooth. It is still served as a light lunch across Portugal, often with crusty bread.

Pairs well with: Crusty bread, white wine & a green salad

Provenance

Portugal flag Portugal

Portuguese Green Soup

Mediterranean & Italy

Time Dedication

45m

15m prep • 30m cook

Batch Yield

4 Servings

278 kcal per serving

1 serving ≈ 430 g

Technical Skill

Easy

Easy (One Pot)

Meal Timing & Digestive Fit

Breakfast

Not Advised

Lunch

Prime Metabolic Fit

Dinner

Ideal Hearty Main

Snack & Tea

Inappropriate

Soups & Broths Occasions: Light lunch, spring, family meals, starter Cost: Low — about $2–3 per serving at home
Tags: Vegetables Savory Vegetarian Soup
A bowl of green watercress soup with a cream swirl, croutons and fresh watercress leaves

Portuguese Green Soup

Photo: Charley from England, CC BY 2.0, via Wikimedia Commons

The Heritage Formulary

Measured Ingredients

Estimated cost: Low — about $2–3 per serving at home (USD)

Sopa de agriao with fresh watercress, potato and vegetable stock, blended smooth and served with croutons.

Execution Methodology & Culinary Technique

Step-by-Step Cooking Guide

Active 45m
P

Prep Stage: Watercress, Potato and Carrot

15 Mins • Washing & Chopping

Wash the watercress very well — grit hides in the leaves — and chop it roughly. Peel and dice the potato and carrot into even 2 cm cubes so they cook at the same speed, and chop the onion and garlic. Heat the vegetable stock in a separate pan so it goes into the pot hot.

Maestro Tip: Cut the potato and carrot the same size: uneven pieces mean some are mushy while others are still hard when you blend.

  1. 1

    Sweat the Onion and Garlic

    5 Mins Medium heat, about 160°C (320°F)

    Warm 15 ml of the olive oil in a large saucepan over medium heat. Add the onion and garlic and cook, stirring often, for about 5 minutes until the onion is soft and clear — do not let it brown.

    Keep the heat medium: browned onion makes the soup bitter and dulls the green colour.

    Done when: Soft, clear onion with no colour.

  2. 2

    Simmer the Potato and Carrot

    25 Mins Simmering, about 95°C (203°F)

    Add the diced potato and carrot and the hot vegetable stock, season with the salt and pepper, and bring to a gentle simmer. Cover and cook for 20–25 minutes, until the potato and carrot are completely tender when poked with a knife.

    A gentle simmer, not a rolling boil, keeps the vegetables sweet and the stock clear.

    Done when: Vegetables that fall apart when poked.

  3. 3

    Blend Until Smooth

    5 Mins Blending, about 80°C (176°F)

    Take the pan off the heat and blend the soup with a stick blender until completely smooth. If it is too thick, stir in a little hot water until it coats the back of a spoon.

    Blend for a full minute longer than you think — a silky soup has no grainy bits at all.

    Done when: A smooth, pale green soup with no lumps.

  4. 4

    Add the Watercress

    5 Mins Gentle heat, about 85°C (185°F)

    Return the pan to low heat, stir in most of the chopped watercress and cook for just 1–2 minutes, until it wilts and turns bright green. Taste and adjust the salt — the watercress is peppery, so go gently.

    Do not cook the watercress long: two minutes keeps it bright green and peppery, ten minutes turns it grey and dull.

    Done when: A vivid green soup with wilted watercress folded through.

  5. 5

    Toast the Croutons and Serve

    10 Mins Oven at 180°C (350°F)

    While the soup simmers, toss the bread cubes with the remaining 15 ml of olive oil and toast at 180°C (350°F) for 8 minutes until golden and crisp. Ladle the soup into warm bowls, swirl a spoonful of cream over each, scatter with croutons and the reserved watercress leaves, and finish with a drizzle of olive oil.

    Toast the croutons just before serving so they stay crisp in the soup.

    Done when: Golden croutons, a cream swirl and bright green leaves on top.

Finishing Touches & Plating

Serve the sopa de agriao hot, in warm bowls, with the cream swirl, croutons and fresh watercress leaves on top — and crusty bread on the side for dunking.

Nutritional Physiology & Benefits

Nutrition

Energy

278

kcal / serving

Protein

6g

Complete AA

Carbs

36g

Complex

Fats

13g

Healthy

Per serving (4 servings · 1 serving ≈ 430 g)
Energy278 kcal
Protein6 g
Carbohydrates36 g
Fat13 g
Fibre4.6 g
Sugar6.5 g
Sodium527 mg
Per 100g
Energy65 kcal
Protein1.4 g
Carbohydrates8.3 g
Fat3.1 g
Fibre1.1 g
Sugar1.5 g
Sodium123 mg

Nutrition values are estimated — calculated from USDA FoodData Central values for the listed ingredients.

Vitamins & minerals: Vitamin K and vitamin C (watercress), vitamin B6 and potassium (potato), vitamin A (carrot), vitamin E (olive oil).

Watercress Brings Vitamin K

About 4.6 g of fibre and a good share of vitamin K and vitamin C per serving come from the 200 g of fresh watercress.

Light and Vegetable-Led

At about 278 kcal a bowl, this is a light, vegetable-led lunch with potato and carrot for staying power.

Olive Oil for Healthy Fats

The olive oil gives the soup its silky finish and about 13.2 g of mostly unsaturated fat per serving.

Food Pairings

What to Eat With

To optimize nutrient absorption and elevate the sensory depth, pair with these authentic accompaniments:

Sides

Crusty Bread

Crusty bread is the Portuguese way to eat soup — it soaks up the green broth and turns a light bowl into a filling lunch.

Vegetables

A Simple Green Salad

A lightly dressed green salad keeps the meal fresh and adds crunch next to the smooth, creamy soup.

Drinks

Vinho Verde

A cold glass of vinho verde, Portugal's light young wine, matches the peppery watercress and the fresh, green flavours.

Sparkling Water with Lemon

Sparkling water with lemon is a clean, alcohol-free partner that refreshes the palate between spoonfuls.

Complete menu

Sopa de agriao with crusty bread and a simple green salad.

Digestive Guardrails

What NOT to Combine

To prevent digestive distress, sluggishness, or palate clash, avoid pairing the dish with these elements:

Adding the Watercress Too Early

Watercress cooked for a long time turns grey and loses its peppery bite — always add it in the last two minutes. This is general food information, not medical advice.

Skipping the Wash

Watercress grows near water and can carry grit and dirt — wash it in several changes of water or the soup will be gritty. This is general food information, not medical advice.

General information only, not medical advice — consult a doctor for personal dietary decisions.

Who Should Eat It

Who Should Eat

  • General adultsA light, fresh soup — a full bowl is a good lunch for most adults.
  • ChildrenMild and smooth once blended; the peppery bite is gentle, and children usually enjoy it with croutons.
  • ElderlySoft, smooth and easy to eat; serve warm, not piping hot.
  • Pregnant womenLight and vegetable-led, but the potato and carrot give about 35.8 g of carbohydrate a bowl — ask your clinician about portion size if you watch carbs.
  • Breastfeeding womenA light, easily digested bowl; the olive oil and potato give gentle energy.
  • AthletesLight on protein at about 6.1 g a bowl — pair it with bread, cheese or an egg for a fuller post-training meal.
  • Weight gainLight and filling for its calories, which suits a higher-energy day when paired with bread.
  • Weight lossAbout 278 kcal a bowl with plenty of fibre — a good light lunch choice for weight loss.

Health Conditions — Adjust or Avoid

Conditions

  • DiabetesAbout 35.8 g of carbohydrate and 6.5 g of sugar per serving; ask your clinician about portion size if you watch carbs.
  • High blood pressureAbout 527 mg of sodium per serving, mostly from the stock and salt; use no-salt stock and ask your clinician if you are on a low-sodium plan.
  • Kidney diseaseLight in protein and potassium from potato; ask your clinician whether this portion suits your plan.
  • GoutLow in purines; a vegetable soup is not a major concern for most people with gout — ask your clinician.
  • Stomach issuesSmooth, mild and easy on the stomach; skip the black pepper if your stomach is sensitive, and ask your clinician if your stomach keeps bothering you.
  • Cardiovascular diseaseLow in saturated fat and rich in vegetables; enjoy freely, and ask your clinician about the right portion for you.
  • Fatty liverLight, low in fat and rich in vegetables; a good choice, and ask your clinician about the right portion for you.
  • Food allergiesContains wheat (croutons) and milk (cream swirl) — the main allergens in this recipe; leave both out for a wheat- and dairy-free bowl, and if you have a food allergy, ask your clinician whether it is safe for you.
  • Special therapeutic dietsFollow your clinician's guidance on sodium and carbohydrate portions; this is general information, not medical advice.

If you have a medical condition, consult your doctor before changing your diet.

Storage & Use

Storage & Use

How to store
Cool, then store in a sealed container in the fridge.
In the fridge
3 days in the fridge, sealed; stir well before reheating.
In the freezer
Up to 2 months, without the cream and croutons; thaw overnight in the fridge.
How to reheat
Warm gently in a pan over medium heat until steaming, about 74°C (165°F); do not boil, or the green colour dulls.
Freezing recommended
Yes, without the garnish — add fresh cream and croutons after reheating.
Signs it has spoiled
Sour smell, grey colour, or a slimy surface.

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