authentic is chickpeas, garlic, olive oil, tahini all mushed up together. Add lemon juice, salt and pepper to taste.
I can't do raw garlic anymore (too much of it when i was a student in the late 80s I guess) so I cook the garlic in some olive oil first (gives a milder + sweeter taste). Also for a change (and for weaning food) i sometimes use greek yoghurt instead of tahini. Paprika is also good as a seasoning.