Roast the nuts in a pan without fat until golden brown. Wash parsley, shake dry and chop finely. Mix vinegar, salt, pepper and 1 pinch of sugar. Fold in the oil and stir in the parsley.
Peel and quarter the pineapple, cut out the stalk. Cut the flesh into thin slices. Cut the beetroot into thin slices (be careful, it stains strongly! Wear disposable gloves). Arrange pineapple and beetroot alternately on plates in a fan shape.
Spread mozzarella and nuts on top. Drizzle vinaigrette over it. Serve with baguette.