Add the oil to a heavy pan with the onions and capsicum and fry on medium-high heat for about 5 minutest.
Add Harissa Dry Spice, salt, garlic and tomato and continut to cook for a further 5 minutes or until the onion is well browned and caremalised. Remove from heat and allow to cool, 10-15 minutes.
Add the parsley and coriander to a blender with the harissa mix, the lemon juice and lemon zest. Blend for a few seconds until mostly smooth but with some texture.
To serve, place the harrisa paste in a serving bowl or spoon it directly onto the food you want to spice up.