Place the lemon juice, tahini paste, and roasted garlic in a food processor and process until the garlic breaks down into a smooth paste.
Add the feta cheese and continue to blend until the feta breaks down almost like a paste. Add half the chickpeas, 2 tablespoons of the chickpea liquid, and 1 tablespoon of the olive oil. Continue to process until smooth. Add the remaining ingredients - rest of chickpeas, 2 tablespoons water, and 2 tablespoons olive oil along with salt and cumin powder and continue to blend until the hummus is smooth.
