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Drain chickpeas, reserving 75ml (1/4 cup) liquid
Process in a food processor until smooth.
Add garlic, tahini and lemon juice, season with salt, then process until very smooth.
If the hummus is too thick, add reserved cooking liquid, 1 tablespoon at a time, until it has reached the desired consistency. (Hummus thickens as it cools, so check the consistency just before serving.)