In a small saucepan, bring the wine, water, and sugar to a boil over medium heat, stirring often, until sugar dissolves. Add the pears; reduce the heat, and simmer until tender, 5 to 10 minutes.

Stir in the lemon juice and pinch of salt; cool completely. Transfer to a shallow baking dish. Freeze until solid, about 6 hours up to overnight.

With a fork, break the frozen mixture into large pieces. In batches, puree in a food processor until completely smooth, 2 to 3 minutes per batch. Transfer to an airtight container; freeze until ready to serve (sorbet will be soft).