2. Place garbanzo beans in a small saucepan or pot, add 1 teaspoon baking soda (this alters the pH to encourage the beans to break down and shed their skins), and cover with a few inches of water. Bring to a boil and cook for 20 minutes, until the skins begin to fall off and the beans look overcooked/mushy. You may need to reduce the heat after a few minutes to prevent boil-overs.
3. While the garbanzo beans are boiling, combine the garlic and lemon juice with 1/4 teaspoon salt in the workbowl of your food processor. Pulse until a fine, uniform consistency is achieved. You may need to scrape down the top and sides of the bowl to ensure the garlic is chopped finely enough. Leave the mixture for at least 10 minutes for the raw garlic taste to mellow.
4. After 20 minutes of boiling, drain the garbanzo beans and their skins in a mesh strainer, then rinse for at least 30 seconds with cold water to remove any lingering taste from the baking soda.
5. Add the tahini to the food processor. Blend until creamy. Scrape down the sides and bottom of the bowl.
6. While the food processor is running on "high," slowly drizzle in two tablespoons of ice-cold water. Continue to run on high, scraping down the bowl as necessary (1-3 times), until the mixture has enough air worked into it that it lightens in color and thickens in texture substantially.
7. Scrape down the bowl again, then add the garbanzo beans and cumin (and za'atar, if you have it). Pulse a few times, then set the food processor to high again. Drizzle in 1 tablespoon of olive oil, as slowly as you can manage.
8. Continue to process the hummus on high for at least one minute longer, up to three minutes longer if it hasn't become smooth enough yet. You can make the hummus thinner at this point by slowly adding ice water a teaspoon at a time while processing on high. Taste the hummus at this point to determine if it needs more lemon juice or more salt for flavor.
9. Transfer the hummus into a serving bowl and smooth out the surface with the back of a spoon, creating swirls or indentations for olive oil as desired. Top with additional olive oil and optionally finely chopped fresh parsley, more za'atar, or a sprinkling of sumac (a spice mixture) or dukkah (a seed mixture).
10. Serve immediately or transfer to an airtight container and store in the refrigerator for up to one week.
