First make the harissa sauce by mixing all the ingredients together except the cumin seeds.
Heat a frying pan on medium heat; add the cumin seeds and dry-fry them until fragrant.
Add the harissa sauce to the pan and stir for approximately 30 seconds and then remove from the heat and let it cool down.
Now combine all the ingredients for the chickpea salad together and pour over the harissa sauce and mix till everything is coated in the sauce and adjust the seasoning.
Chill for a few hours so that the flavours really meld together.