Lightly toast shallots in a dry pan until golden and crispy before adding to the salad, then toss them in at the very end to maintain their textural contrast and prevent sogginess.

Start with half the recommended fish sauce in your dressing and gradually whisk in more while tasting—its pungent umami can easily overpower delicate tropical fruit if you're not careful.

Prepare mango, pomelo, and dragonfruit immediately before assembly to prevent oxidation and maintain vibrant colors, texture, and peak freshness of the delicate tropical fruits.

Zest the lime before juicing it, as fresh zest adds concentrated citrus oils and aromatic complexity that plain lime juice alone cannot deliver in this umami-forward dressing.

Make the sweet umami dressing 30 minutes ahead and refrigerate it separately, then dress the fruit salad just before serving to keep fruits crisp and prevent them from becoming waterlogged.