The 3-Ingredient Sauce That Elevates Any Chicken (Watercress Butter)

Ingredients

• 120 g Watercress Leaves (fresh, stems removed, washed and patted dry)
• 120 g Unsalted Butter (softened to room temperature)
• 1.2 kg Whole Chicken (about 4‑5 lb, cleaned, trussed if possible)
• 3 L Chicken Stock (homemade or low‑sodium store‑bought)
• 200 ml Heavy Cream (cold)
• 2 Carrots (peeled, cut into 2‑inch pieces)
• 2 Celery Stalks (cut into 2‑inch pieces)
• 1 Leek (white and light green parts only, sliced)
• 1 Onion (medium, quartered)
• 2 tsp Coarse Sea Salt (for seasoning the stock)
• 1 tsp Black Pepper (freshly ground)

Instructions

1. Prepare Watercress Butter

   Remove stems from watercress leaves, wash the leaves in cold water twice, then pat completely dry with a clean kitchen towel.

   Time: PT5M

2. Process Watercress

   Place the dried watercress leaves in the food processor with the small blade attachment. Pulse for 30 seconds, scrape down, then pulse another 30 seconds until a wet paste forms.

   Time: PT2M

3. Emulsify Butter

   Add the softened butter to the watercress paste in three portions, mixing after each addition until a smooth, pale green compound butter forms.

   Time: PT5M

4. Shape and Chill Butter Log

   Transfer the butter onto a sheet of parchment, roll it into a rough log (about 5 cm diameter), wrap tightly in plastic wrap, and refrigerate for at least 15 minutes (or freeze for 5 minutes if in a hurry).

   Time: PT15M

5. Prepare Vegetables and Aromatics

   Peel and cut carrots, celery, and potatoes (if using). Slice leek (white part only) and quarter the onion. Set aside.

   Time: PT10M

6. Bring Stock to a Boil

   In the large saucepan, bring 3 L of chicken stock to a rolling boil over high heat. Add 2 tsp coarse sea salt and 1 tsp black pepper.

   Time: PT5M

7. Add Aromatics and Chicken

   Add the sliced leek, quartered onion, and a handful of extra leek pieces to the boiling stock. Carefully lower the whole chicken into the pot (remove a little stock first to avoid overflow).

   Time: PT3M

8. Simmer Chicken

   Reduce heat to maintain a gentle simmer. Add carrots and celery pieces. Partially cover the pan and simmer for 40 minutes, or until the internal temperature of the thickest part reaches 74 °C.

   Time: PT40M

9. Reserve Broth and Vegetables

   Using a slotted spoon, remove the chicken and set it on a warm plate, keeping the lid on the pot. Transfer the cooked vegetables to a separate pan with a splash of broth to keep warm. Skim the broth, discard the aromatics, and measure 300‑350 ml of the clear broth for the sauce.

   Time: PT5M

10. Reduce Broth

    Strain the reserved broth through a fine mesh sieve (or cheesecloth) into a clean saucepan. Bring to high heat and reduce by one‑third, about 100‑120 ml remaining.

    Time: PT5M

11. Add Cream and Reduce

    Stir in the cold heavy cream and continue to simmer, reducing the mixture by half until it reaches a semi‑syrupy consistency.

    Time: PT3M

12. Incorporate Watercress Butter

    Remove the pan from heat. Cut 60 g of the chilled watercress butter into small cubes. Whisk the butter into the hot sauce a few pieces at a time until fully emulsified. Finish with the remaining butter, stirring gently; the sauce should coat the back of a spoon.

    Time: PT5M

13. Carve and Plate Chicken

    Carve the poached chicken into breast slices or desired portions, removing excess skin if desired. Arrange on warmed plates, spoon over the watercress‑cream sauce, and surround with the reserved vegetables.

    Time: PT5M

Nutrition Facts

Calories

350

Protein

30 g

Carbohydrates

15 g

Fat

20 g

Fiber

3 g

Ingredient Substitutions

• Instead of Watercress Leaves: baby spinach, arugula
• Instead of Unsalted Butter: cultured butter
• Instead of Whole Chicken: bone‑in chicken thighs, cornish game hen (adjust stock)
• Instead of Chicken Stock: vegetable stock
• Instead of Heavy Cream: half‑and‑half, creme fraiche (less liquid)
• Instead of Carrots: parsnips
• Instead of Celery Stalks: fennel stalks
• Instead of Leek: shallot
• Instead of Onion: shallot
• Instead of Coarse Sea Salt: kosher salt
• Instead of Black Pepper: white pepper

Equipment Needed

• Food Processor
• Mixing Bowl
• Plastic Wrap
• Large Saucepan (26 cm, high sides)
• Fine Mesh Sieve
• Chef’s Knife
• Cutting Board
• Timer
• Ladle
• Small Rolling Mat or Parchment Sheet (optional)

Critical Steps — Do Not Skip

• Processing watercress into a wet paste without over‑blending
• Emulsifying the butter gradually to achieve a smooth compound butter
• Starting the poach in boiling stock (cooking by concentration) to lock in flavor
• Reducing the broth by one‑third before adding cream
• Incorporating the watercress butter off‑heat to prevent separation

Chef Tips from the Video

• Using fresh watercress leaves without blanching preserves their peppery flavor.
• The "cooking by concentration" method is similar to searing; it firms the meat’s surface and locks juices.
• For an extra glossy finish, strain the sauce through a double layer of cheesecloth.

Troubleshooting

Storage

Refrigerator: Compound butter: up to 5 days wrapped tightly; sauce: 2 days in an airtight container; cooked chicken: 3 days.

Freezer: Butter log: up to 2 months wrapped in foil and a freezer bag; sauce: up to 1 month, reheat gently.

Room temperature: Do not store cooked chicken or sauce at room temperature for more than 2 hours.

Make-Ahead Tips

• Prepare the watercress butter a day ahead and keep it wrapped in the fridge.
• Make chicken stock in advance; strain and refrigerate.
• The reduced broth can be frozen in ice‑cube trays for quick sauce prep.

Frequently Asked Questions