Make berry sauce. In a small saucepan, add the raspberries, lemon juice, sugar, cornstarch, and water, and bring to a soft boil. Turn the heat to low, continue cooking until the syrup thickens, stirring as needed. Once the sauce thickens, turn off the heat. Set aside to cool completely and store in the fridge until ready to use.
Bloom the gelatin. Pour the water into a small saucepan and sprinkle the gelatin on top. Whisk and leave for 5 minutes.
Melt gelatin. Place the saucepan on the stovetop over medium-low heat. Stir the mixture and cook until the gelatin is incorporated.
Add flavoring. As you continue to stir, add the sugar and vanilla. Continue to mix until the sugar is dissolved.
Add cream. Stir in the cream and milk, and cook for another 2 minutes over low heat.
Cool to thicken slightly. Refrigerate uncovered for 1 hour or until the mixture has just about fully cooled. (If you cool too long, it will set.)
Individual dishes. Once the mixture has cooled, pour it into greased individual dishes. Refrigerate 4-6 hours or overnight.
Toppings. Top the cooled panna cotta with the cooled berry sauce or your desired topping.
Serve and enjoy, friends.