
Cook the wheat berries: Since wheat berries take around an hour to cook, I like to make extra and freeze it for later. To cook the wheat berries, bring 4 quarts of water to a boil in a large pot. Stir in the wheat berries and ½ teaspoon salt. Partially cover the pot with a lid and cook, stirring often, until the berries are tender but still a little chewy, about 45 minutes to 1 hour. Drain the wheat berries and let them cool to room temperature or close to it (you can speed up the cooling by pouring them onto a rimmed baking sheet or pouring them into a large bowl, stirring occasionally).
In the meantime, whisk together the dressing ingredients. It should taste nicely tangy; you can add another tablespoon lemon juice to make it more zippy, or another pinch of salt for more flavor overall.
Transfer the cooled wheat berries to a big bowl. Add the chickpeas, carrots, feta cheese and arugula and toss to combine. If you’ll be serving the entire salad within the next few hours, drizzle in all of the dressing and toss to coat. If you’re planning on leftovers, store the dressing separately and dress individual portions before serving.