
Bright, peppery watercress meets fresh lemon in this vibrant blender sauce that comes together in just a few minutes with zero fuss. The watercress gives it a bold, slightly bitter edge that balances beautifully against the citrus, while a drizzle of olive oil emulsifies everything into a silky, pourable consistency. A small clove of garlic adds just enough depth without overpowering the fresh green flavor, and a handful of flat-leaf parsley can round it out even further if you have it on hand. Since every ingredient here is plant-based and whole, there's no need to scan labels or worry about hidden animal proteins sneaking in — it's naturally free of any poultry-derived additives. This kind of sauce is endlessly versatile: spoon it over roasted vegetables, swirl it into grain bowls, or use it as a bright dipping sauce for crusty bread. The quick emulsification technique — streaming in the olive oil while the blender runs — is what gives it that restaurant-quality smoothness without any special equipment. It's the kind of recipe that makes you feel like a much fancier cook than the ingredient list would suggest.
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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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