In a medium saucepan, bring cream and sugar to a boil over medium-high heat, stirring constantly to dissolve the sugar, about 2 minutes. Keep boiling and stir constantly for 3 minutes, adjusting heat as needed to prevent boiling over. Remove from heat, then stir in lime juice and cool for 10 minutes. Stir again and divide mixture between 4 (8-ounce) small glasses or ramekins. Cover and chill until set, at least 4 hours or overnight. Top with sliced peaches, then sprinkle sugar and char using the torch.