For the Nuri spread, peel and finely dice the onion. Drain the sardines a little and puree finely in a blender with 1.5 packs of curd cheese, freshly squeezed lemon juice and cornichons.
Depending on the desired spiciness, add the canned piri-piri (possibly only 1), season with salt and pepper and puree again. Add olive oil to give a more spreadable consistency.
By hand, stir in the diced onion and the remaining curd cheese until well blended and refrigerate the Nuri spread for at least 1 hour.