Coarsely grate the onion and the potatoes. Drain and sieve extracting as much moisture as possible
Mix with the parsley and season to taste
Drop tablespoonfuls of the mix into hot oil, flattening each rosti with the back of a spoon
Cook for 3-4 mins on each side, drain and keep warm
Season the salmon with lemon and black pepper
Mix the dill into the sour cream
Recipe Notes
To serve arrange a rosti on a plate, smother with the dill cream and top with the smoked salmon. Top with a t of caviar if using and decorate with cucumber and a sprig of dill.