Wash and pat dry the parsley. When it’s completely dry, finely chop the leaves and the tender stems (only) using a very sharp knife. You want to create a fine chop and not tear through the parsley, which would make it wet and clumpy. Put the parsley into a small mixing bowl.
Using a microplane, or a garlic crusher, finely grate the garlic directly into the mixing bowl.
Using the same microplane, or a zester, finely zest the lemon (or other citrus) directly into the bowl as well so you don’t lose any citrus oils. (Zesting the citrus after the garlic will also help rid the microplane of the garlic smell too!)
If you’re making the dry condiment version, stop here. Consider what you’re serving the gremolata with and season with salt and pepper if you think it needs it. Mix and serve.
If you’re making a dressing or saucier version, add 1-2 tablespoons of lemon (or blood orange) juice, the extra virgin olive oil and some salt and stir to combine. You can add more citrus juice and olive oil as needed to reach the consistency you’re after. Serve spooned over or swirled into your dish.