Soak the crushed garlic in the freshly squeezed lemon juice for 5 minutes.
Add the chickpeas to the food processor as well as the lemon juice, garlic, tahini and half of the cold water and process. If the food processor is having a little bit of difficulty moving the mixture then add a little bit more of the water to get it moving, but not too much as you do not want the hummus to be too watery.
Then add in the rest of the ingredients; cumin, salt, olive oil and more remaining cold water (if you need it) and process until smooth.
Add the cayenne pepper (optional) and then process again.