Add cold water to a small saucepan.
Mix in gelatin and allow to sit for 5 minutes.
Stir in boiling water, sugar, lemon juice, and raspberries.
Bring to boil on medium heat.
Turn down the heat to low and boil for 5 minutes.
Remove from heat and stir in vanilla.
Place mixture in a blender food processor and blend until smooth. Then use a rubber scraper to push the warm puree through a strainer.
Allow to cool 10 minutes.
Pour the whipping cream into a large mixing bowl and beat with an electric mixer until stiff peaks form.
Fold in the raspberry puree and allow to cool in the refrigerator for at least 4 hours or overnight.