
Bright, peppery watercress meets zingy lemon in this vibrant blender sauce that comes together in just a few minutes with almost no effort. The watercress gives it a gorgeous deep green color and a slightly bold, garden-fresh bite that gets mellowed beautifully by the olive oil emulsion. Streaming the oil in while the blender runs is the small trick that transforms a simple purée into something silky and restaurant-worthy. A touch of garlic and optional flat-leaf parsley round out the flavor without overpowering the star ingredients. This sauce is completely plant-based, built entirely from fresh produce, citrus, and good olive oil — no animal products of any kind sneak in. It's endlessly versatile: spoon it over roasted vegetables, grilled fish, grain bowls, or use it as a punchy salad dressing thinned with an extra splash of water. Once you have a jar of this in the fridge, you'll find yourself reaching for it all week long.
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Combine the watercress, lemon juice, lemon zest, garlic, water, salt, and black pepper in a blender or food processor. Add the parsley, if using.
Blend on high speed for 30 seconds, until the greens are fully broken down and the mixture is a uniform, bright green purée.
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