Mary Berry Watercress Sauce Recipe

This Mary Berry-inspired watercress sauce is a smooth, creamy British classic that tastes fresh and peppery, with a gentle tang from lemon and mustard. It has a silky, pourable texture that feels special, but it is genuinely easy to make, even if you are new to sauces. There is no tricky timing, just a simple roux, a quick simmer, then a blitz. Total time is about 15 minutes.

Ingredients

For the creamy watercress sauce

• 25g unsalted butter
• 25g plain flour
• 300ml whole milk, warmed
• 100ml double cream
• 60g watercress, tough stems removed
• 1 tsp Dijon mustard
• 1 tbsp lemon juice (plus extra to taste)
• ¼ tsp fine salt, or to taste
• ¼ tsp black pepper, or to taste
• Pinch of nutmeg (optional)

How to Make Mary Berry Watercress Sauce Recipe

• Prepare the oven: There is no oven needed for this recipe, but do get everything ready before you start. Warm the milk (do not boil), rinse the watercress, and remove any thick stalks so the sauce comes out silky.
• Start the base: Melt the butter in a small saucepan over medium heat. Add the flour and stir continuously for 1 minute to form a smooth paste. This quick cook takes away any raw flour taste.
• Mix until smooth: Add the warm milk a splash at a time, whisking well after each addition. Once all the milk is in, simmer gently for 2 to 3 minutes, stirring often, until the sauce thickens and looks glossy.
• “Bake” (gentle simmer): Stir in the double cream, Dijon mustard, lemon juice, salt, pepper, and nutmeg (if using). Keep the heat low and cook for 1 minute. You want a gentle simmer, not a rolling boil.
• Add the watercress: Tip in the watercress and stir for 30 to 60 seconds until wilted. The leaves should stay a fresh green, so do not overcook.
• Cool slightly: Take the pan off the heat and leave the sauce for 2 minutes. This small pause makes blending safer and helps keep the sauce smooth.
• Assemble and serve: Blend until smooth using a stick blender, or carefully pour into a blender and whizz until velvety. Taste and adjust with a pinch more salt, pepper, or a squeeze of lemon, then serve warm.

Tips

How do I stop watercress sauce going lumpy?

Warm the milk first, then add it gradually while whisking. If you still get a few lumps, do not panic. A quick blend at the end will smooth everything out.

How do I keep the sauce bright green?

Add the watercress at the very end and wilt it briefly. Avoid boiling hard after the watercress goes in, as high heat dulls the colour.

What if my sauce is too thick or too thin?

If it is too thick, loosen with a splash of warm milk. If it is too thin, simmer gently for 1 to 2 minutes, stirring often, until it coats the back of a spoon.

Can I make it a little lighter?

You can swap the double cream for single cream or crème fraîche, but keep the heat low and stir well. The sauce will be slightly less rich, but still lovely with lamb or fish.

Serving Suggestions

• Spoon over roast lamb, lamb cutlets, or lamb meatballs
• Serve with salmon, smoked haddock, or cod
• Drizzle over chicken breast with steamed new potatoes
• Use as a quick sauce for gnocchi or tagliatelle
• Pour into a warm jug for an easy Sunday roast sauce option

Storage

Room temperature

Do not leave creamy sauces out for more than 2 hours. For best quality and food safety, cool and refrigerate promptly.

Refrigerator

Store in an airtight container for up to 3 days. Reheat gently in a saucepan over low heat, stirring often. If it thickens in the fridge, loosen with a splash of milk.

Freezing

I do not recommend freezing this sauce. Dairy-based sauces can split and turn grainy after thawing. If you must freeze it, blend well after reheating and expect a slight change in texture.

Nutrition

• Calories: 120 kcal
• Carbohydrates: 7 g
• Protein: 3 g
• Fat: 9 g
• Saturated Fat: 5 g
• Sodium: 180 mg

Nutrition values are estimates and will vary depending on the brands and exact ingredients you use.

FAQs