Smoked Salmon balls with Philadelphia cream cheese and walnuts

Difficulty:  Time:  INGREDIENTS (x 6 persons): - 200g smoked salmon (in brine or pre-cooked fillets) - 100g Philadelphia cream cheese -  1 handful of fresh flat parsley, thinly chopped -  1 large handful of grinded walnuts -  2 tablespoons of white onion, finely chopped -  2 tablespoons of lemon juice -  1 pinch of paprika powder WHAT ...