While the chickpeas are cooking, add 4 garlic cloves, lemon juice, and salt to a food processor and blend until relatively smooth. Scrape down the sides and let sit. This will help remove the bite from the garlic.
After ten minutes, add the tahini and blend. It will almost immediately become thick. Slowly add the reserved chickpea liquid until it loosens.
Add most of the cooked chickpeas (save about 1/2 cup) and blend. Slowly add the chickpea liquid until it is smooth and creamy.
If too thick, add some more liquid or if it's too thin, add more chickpeas or emulsify olive oil into the hummus by slowly adding olive oil while the chickpeas are mixing.
Use whatever chickpeas you have left at the end to roast on top or mix in to make a chunkier hummus.
Add cumin and adjust taste to your preference.
Garnish with whatever you like. I used cherry tomatoes, cilantro, sesame seeds, crushed red pepper, minced red onion, and of course, olive oil. Then served with warm pita.