Lightly toast the almonds in the pan until they smell fragrant, then roughly chop. Cut the dates into pieces. Cut the celery diagonally into thin slices.
Make a dressing from lemon juice, olive oil, salt and pepper.
Pour it over the celery, dates and almonds and mix well. Carefully fold in the parmesan shavings. Optionally, garnish the salad with the chilli flakes.