Whisk or shake in a jar together juice and zest from 1 lemon, ¼ cup olive oil, and ½ teaspoon sea salt.
Make Kale Chopped Salad
If you haven't already, chop kale into small pieces.
Place chopped kale in large bowl. Drizzle 2 tablespoons of dressing and 1 teaspoon sea salt and "massage" the kale with your hands until the kale has broken down slightly and is glossy from the dressing, about 1 minute.
Add remaining salad ingredients to kale in bowl—strawberries, raspberries, blackberries, blueberries, chopped cucumbers, half the feta cheese, and half the pistachios—drizzle with dressing, and toss gently to combine, preferably with hands not to break the berries.
Transfer the Kale Salad to a serving bowl or individual salad plates, top with remaining feta cheese and pistachios. Serve any additional dressing alongside.