The tangy heat of this sauce cuts richness and enlivens whatever it touches. Try it with grilled, poached, or fried chicken or seafood. Employ it to amp up a slaw.
Stir together lime juice, ginger, and sugar in a small bowl until sugar dissolves. Stir in fish sauce and chile; let stand until flavors meld, about 15 minutes. Taste to make sure it’s agreeable on a spicy-tart-sweet level; adjust as needed. Serve in a bowl, or use to dress a salad.
Refrigerate in an airtight container up to 3 days. Stir before using.