Quarter the peppers lengthways and remove the seeds. Mix in a bowl with olive oil and salt. Place on the preheated grill and grill each side for 10 minutes until the peppers are soft and slightly blackened on the skin side. ALTERNATIVE PREPARATION IN THE OVEN: Preheat the oven to 180°C and bake the bell pepper quarters for about 25 minutes until they are soft.
Roast the walnuts in the pan until they start to smell.
Puree the roasted peppers together with the walnuts and the remaining ingredients except for the salt in the food processor or blender. The walnuts can still have a bit of bite. Season to taste with salt. Serve with flatbread and / or vegetable sticks.