1.Halve grapes. Thinly slice apples into rounds on a mandoline or V-slicer. Place grapes and apple in a large bowl wtih juice; toss gently to combine. Cover.
2.Stir nuts in a small frying pan over medium heat until toasted lightly. Cool; chop coarsely.
3.Place apple and grape mixture on platter; top with cheese, nuts, watercress, parsley and oil. Serve with lemon wedges.
You will need a bunch of watercress that weighs about 350g.Note