Prepare the Atraf Tib: Grind the bay leaves, rosebuds, and spikenard. Mix with ginger, cardamom, nutmeg, mace, betel nut, long pepper, black pepper, clove, caraway, and coriander in a small bowl. Store the excess spice mix in an airtight container.
Soak and Cook Chickpeas: Soak chickpeas in cool water for 8 hours. Drain and rinse, then place in a medium saucepan. Cover with 4 inches of water. Simmer over medium heat for about 90 minutes or until soft enough to mash. Drain and cool.
Blend the Hummus: Optional: Peel chickpeas for a smoother texture. Mix tahini with ½ cup cold water until dissolved. Add to chickpeas along with vinegar, olive oil, and black pepper. Blend in a food processor.
Add Mix-ins: Add chopped olives, all nuts, mint, parsley, preserved lemon, Atraf Tib, rue, salt, cinnamon, caraway, and coriander. Blend until smooth. If mixing by hand, finely chop or grind mix-ins before combining.
Rest and Serve: Spread hummus on a plate, cover, and refrigerate at least 8 hours. Before serving, bring to room temperature, garnish with extra herbs, nuts, and olive oil.