step 1
Drain the chickpeas and put them in a pan of boiling water with the bicarbonate of soda. They should be covered by a few cm of water. Leave for 20 minutes. Then drain and pour cold water over.
step 2
Meanwhile, chop the garlic and put it in a food blender with the lemon juice and salt. Leave the mixture to rest for 10 minutes.
step 3
Add the tahini to the above and blend until the mixture is thick and creamy. Then whilst running the food blender add in 2 tbsp of cold water.
step 4
Add the cumin and chickpeas. Whilst blending pour in the olive oil. Blend until smooth.