In a food processor or blender, add the zucchini and pulse to chop into small pieces.
OPTIONAL: Scoop out the zucchini and put into a mesh colander and press with the back of a spoon to remove excess water. Return to processor.
Add the garlic, tahini, 1 tablespoon olive oil, lemon juice, and salt, and blitz everything together until smooth. Add the second tablespoon of olive oil if desired.
Store in the refrigerator until ready to serve.
Notes
The zucchini will create excess liquid as the dip rests; stir it back into the hummus or carefully drain before serving.