Meanwhile, make the hummus. In a food processor, blend the chickpeas for about 1 minute. Scrape down the sides and blend for another 30 seconds or so. Add the tahini, lemon juice and salt and blend until smooth. With the machine running, pour in 1 tablespoon of water at a time, until you get a smooth, creamy mixture. Taste and adjust seasonings, adding more lemon or salt if needed.