Step 1A few hours before serving, place the peach slices in a bowl; toss with the sugar and lemon juice. Let stand at room temperature.
Step 2To serve, divide the peaches and juices among 6 shallow bowls.
Step 3Top with ice cream, 2 scoops each. Stir the framboise into the raspberry sauce, if using. Pour the raspberry sauce over the ice cream, dividing evenly. Garnish with raspberries, if using. Serve immediately.