Drain the sardines and tip the sardines into a bowl, reserving the oil. Remove the backbones if there are any, and discard. Lightly mash the sardines using a fork. Mix in the crème fraîche, yogurt or soured cream, the lemon zest and a splash of the juice, the shallot, parsley and smoked paprika, cayenne pepper and onion granules. Season well and add more lemon juice, if needed. Drizzle over the reserved oil to serve.