To the canister of a food processor fitted with the S-blade or to the canister of a blender, add the tahini, lemon juice, and blend on high-power for about 90 seconds until smooth and fluffy. Note - For the entire recipe, I keep my food processor running on high power and add ingredients through the feed chute. I don't stop to scrape down the sides of the canister but if you feel you should stop to scrape down, do so. Add the garlic and process for about 1 minute. Add 2 to 3 tablespoons of olive oil, the cumin, paprika, salt and pepper to taste, and optional cayenne (doesn't make hummus spicy, makes it not taste bland). Add the garbanzo beans and process only as long as necessary until desired texture is achieved. I prefer a small amount of texture retained so I process for less than 1 minute. As necessary for desired consistency, drizzle in the reserved bean liquid. Stop to taste hummus and make any tweaks necessary, to taste. Place hummus in a serving bowl, drizzle with olive oil and sprinkle with paprika, to taste. Serve immediately with your favorite dippers or chill covered for about an hour before serving. Hummus will keep airtight for up to 4 days in the fridge. Recipe doubles and triples easily.