Blend lemon juice, olive oil, tahini, vinegar, garlic, shallots, scallions, spinach, dill, nutritional yeast, and oregano until smooth. Season with salt and pepper.
In a large bowl, toss cabbage, cucumbers, scallions, and feta. Pour dressing over the salad and toss to coat. Garnish with dill and sesame seeds, and serve with pita.