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1
Bring a large pot of water to the boil. Wash arugula, parsley, and kale (no need to dry them). Trim off any large stems. Add salt to water and turn down to a simmer. Toss in the kale. Blanch for five minutes, stirring occasionally. Remove kale with tongs and place in a colander over a large bowl. Using the same water, blanch parsley and arugula for only one minute. With tongs, remove second batch of greens and add to draining kale. Allow all greens to cool for a few minutes. Form greens into a ball and squeeze out most of the liquid. Place in food processor.
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2
With a mortar and pestle, bash anchovy and garlic to a paste. Into the food processor, add anchovy/garlic paste, lemon juice/zest, capers, vinegar, and olive oil. Pulverize the heck out of it for 30 seconds. Taste for balance and texture. Add salt, more lemon juice, or vinegar as needed. Pulverize more if texture is too coarse.
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3
You can keep it in a jar in the fridge with a thin layer of olive oil on top (just know that it won't be vibrant green by the next day). Or you can freeze it in a jar or in an ice cube tray. It stays green and beautiful when you freeze it. Thaw for an hour or so at room temperature before using.
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4
If you're extending some of the Gremolata into pesto, leave 1 cup of Gremolata in the food processor. Add warm nuts, goat cheese, parmesan, and olive oil. Taste. It will probably need more salt. Maybe a bit more acid like lemon or vinegar.
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5
Keeps for a few days in the fridge in a jar with a thin layer of olive oil on top of the pesto. Alternatively, you can freeze it in a jar or in an ice cube tray for easy access. Thaw by leaving it out room at temperature for an hour or so.
