Let the raspberries thaw a little. Wash limes hot, dry and cut into pieces. Spread 1 tablespoon of sugar on four glasses (approx. 300 ml each). Crush with a wooden pestle until the sugar has dissolved. Add the raspberries and also crush them slightly. Fill the glasses with ice cream, filling them to the brim. Pour 50 ml Mezcal into each glass and serve immediately.