Add the greens to a large serving bowl and top with red onion, radishes, sunflower seeds, avocado, and dried cranberries (optional).
Next, drizzle on tahini and olive oil and squeeze on lemon juice (no need to mix beforehand! The separation makes for more enhanced individual flavors + 1 less dish). Season with salt and pepper, and toss gently before serving.
Best when fresh, though leftovers keep (undressed) up to 3 days in the refrigerator.
*Nutrition information is a rough estimate calculated with dressing and without cranberries.