Place the sugar, measured water, and lemon juice into a saucepan and heat gently until the sugar dissolves. Bring to a boil, add the pears, and poach gently, basting occasionally with the sugar syrup, for 20 to 25 minutes, until the pears are tender. Cool, then puree in a food processor.
Add the chopped ginger to the pear puree. Pour the pear mixture into a freezer container, and freeze for 2 hours, until just mushy. Transfer the mixture to a bowl and whisk gently to break down any large crystals.
Beat the egg whites until stiff but not dry, then fold into the pear mixture. Return to the freezer and freeze until firm. Transfer the sorbet to the refrigerator to soften for about 30 minutes. Garnish with the strips of ginger. Serve and enjoy!