tangy

This word carries a positive, refreshing connotation, suggesting a zestfulness that is stimulating rather than overwhelming. It describes a sharp quality that is desirable, like the zip of a lime or the bite of a sourdough starter, rather than something harsh or unpleasant.

It differs from sour, which can imply spoilage or an overly acidic taste that causes a wince. While sour is a neutral or negative descriptor of acidity, tangy suggests a sophisticated, bright balance often sought after in culinary arts.