
Bright, peppery watercress meets zingy lemon in this vibrant blender sauce that comes together in just a few minutes. The peppery bite of the watercress is balanced beautifully by fresh lemon juice and zest, while a slow stream of olive oil emulsifies everything into a silky, pourable consistency. Garlic adds a subtle backbone, and the optional parsley nudges the color into an almost electric green that looks stunning drizzled over grilled fish, roasted vegetables, or a simple grain bowl. For anyone navigating sesame-free cooking, store-bought sauces and condiments can be a minefield of hidden tahini or sesame oil — this one is built entirely from fresh, whole ingredients with zero ambiguity. The blender does all the heavy lifting, so there's no chopping finesse required and cleanup is minimal. It's the kind of versatile, restaurant-worthy sauce you'll want to keep in the fridge all week.
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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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