Cook the barley according to package instructions. Drain and let cool.
Rinse and drain the beans and lentils if using canned.
Combine the cooked barley, beans, lentils, kale, carrots, shallots, and parsley in a large bowl.
Make the dressing: Blend miso, lemon juice, date syrup, mustard, garlic, parsley, basil, and water until smooth. Add more water as needed. Season with more lemon juice and salt to taste.
Pour the dressing over the salad and toss well to coat.
Stir in pumpkin seeds (if using) and mix again.
Serve room temperature or cold.
