01 - 
                Sprinkle the gelatin evenly over the cold water in a small bowl. Allow it to bloom for 5 to 10 minutes until softened.
              
              
              
                02 - 
                Combine the heavy cream, whole milk, and granulated sugar in a saucepan. Warm over medium heat, stirring occasionally, until the sugar dissolves and the mixture is hot but not boiling.
              
              
              
                03 - 
                Remove the dairy mixture from the heat. Stir in the softened gelatin, vanilla extract, and salt, ensuring the gelatin is fully dissolved.
              
              
              
                04 - 
                Divide the panna cotta mixture evenly among 8 ramekins or moulds. Set aside to cool to room temperature.
              
              
              
                05 - 
                Refrigerate the ramekins for at least 4 hours or overnight until the panna cotta is firm to the touch.
              
              
              
                06 - 
                While the panna cotta chills, combine the mixed berries, sugar, and lemon juice in a saucepan. Cook over medium heat, stirring gently, until the berries are softened and the sauce has thickened slightly. Allow to cool completely.
              
              
              
                07 - 
                Unmould the panna cotta onto serving plates if desired. Spoon berry sauce over each portion and present immediately.