Bring the raspberries to the boil in a pot, pass through a sieve and allow to cool. In the meantime, put 2 tablespoons of lemon juice and sugar on 2 plates. Dip the glass rim first in lemon juice, then in sugar and let it dry for a short time. Shake raspberry puree, grenadine, vodka, cream, 1 tablespoon lemon juice and milk with crushed ice in a cocktail shaker. Strain the cocktail through a sieve into the prepared glass. Serve decorated with a few drops of grenadine