P.S. I make hummus from 1/2 pound dry garbanzo beans cooked for a long, long time. Add 1/4 teaspoon of baking soda near the end to ensure soft, mushy beans. Maybe 15-20 minutes of extra cooking after that, then drain off excess water and let cool. The beans shouldn't be dry, of course, but not soupy, either. There are vegan recipes that use that leftover liquid, so consider saving it.

In a food processor, add several cloves of garlic, about 3 tablespoons tahini, and a bit of salt (maybe 1/2 teaspoon or less). Add somewhat cooled beans, 1/2 teaspoon sumac, and about 1-2 small lemon of zest and juice OR 1/2 -1 large lemon. You can save some juice to the side for correcting flavor later. Optionally add pine nuts or other flavor agents, like roasted red peppers or parsley. I diverge from the standard hummus by adding a glug of olive oil directly into the mix as well as using it as a topping, so add a couple tablespoons in if you so desire. Buzz repeatedly, scraping down the sides as needed until you have a creamy mix. Correct seasoning as desired, then put in a bowl, create a swirling depression in the middle and sprinkle with sumac, then drizzle with olive oil. Serve immediately or cover and refrigerate. A good olive oil may make it stiffen up in the refrigerator, so if you are going to eat it cold and added oil to the blend, you may want to make it with extra liquid.

My baba ghanous is almost the same recipe, but with roasted eggplant instead of beans, and extra tahini when the eggplants are over-mature, which means darker, more bitter seeds (and which the extra tahinin cuts).