In a large bowl, soak 1 cup of dried chickpeas in water overnight on the counter.
In the morning, drain water. Bring a pinch of salt and a few cups of water to a boil. Add in chickpeas, reduce to simmer, and cook until soft (about an hour).
Roast garlic in the oven for 30 minutes at 400F (covered with foil). Remove and allow to cool to touch.
Once chickpeas are soft, drain water from chickpeas (reserve about ¼ cup of cooking water).
In a blender combine chickpeas, cooking water, Tahini, juice of lemon, cumin, salt, and roasted garlic cloves (squeezed out of skin). Blend until smooth. Slowly add in enough olive oil until desired consistency.