If Piavé cheese is not available, a good quality Parmesan can be used in its place.
For dressing, whisk balsamic vinegar with mustard. Slowly pour in olive oil while whisking. Season to taste. If dressing seems thick, whisk in a tablespoon or 2 of water (this allows the dressing to coat the arugula without weighing them down).
To assemble the salad, arrange arugula on a platter. Remove core from pineapple and slice as thinly as possible (on a mandolin is best). Arrange pineapple over arugula. Slice red onion and arrange on salad. Sprinkle pine nuts over. With a vegetable peeler or cheese knife, pull curls or thin shards of Piavé over. Drizzle dressing over, season lightly and serve.
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