Place the garbanzo beans, lemon juice, garlic, tahini, spinach, avocado, chives, salt and cayenne pepper into a food processor or blender. Process/puree until creamy. Stream in olive oil and 2 tablespoons of the reserved garbanzo beans liquid.
Transfer to a serving dish and refrigerate until ready to serve. Sprinkle extra cayenne pepper over the top and serve with crackers or vegetables.
Notes
If you prefer a less spicy hummus, omit the garlic and cayenne pepper.
If you do not have tahini on hand, replace it with cashew, almond or peanut butter.