Strain through a fine meshed sieve. Use the bottom of a soup ladle to easily push the juice through the sieve.
Place strained raspberries into a bowl.
Mix in sugar and lemon juice. Stir until the sugar has completely dissolved.
½ cup sugar, 1 tablespoon lemon juice
Place cold water in a small saucepan. Sprinkle gelatin over the water. Stir in and let set for 1-2 minutes. The gelatin will thicken. This is a process called blooming and you want to make certain you do this before heating it.
¼ cup cold water, 2 ½ teaspoons unflavored gelatin
Place saucepan over medium-low heat and heat just until the gelatin becomes clean and everything is liquid. Do not bring to a boil. Keep a close eye on the mixture because this will happen quickly.
Allow gelatin to cool for 1-2 minutes and then pour into raspberry mixture. Stir well.
Add whipping cream and mix together with an electric mixer just until the mixture starts to thicken. Droplets of the mixture should hold their shape and slowly melt away.
1 ½ cups heavy whipping cream
Pour into serving dishes, cover and refrigerate for at least 1 hour until fully chilled.
Whipped Cream Topping
Whip the remaining whipping cream until soft peaks have formed. Stir in sugar. If you prefer a sweeter whipped cream, add sugar to your liking. ½
½ cup heavy whipping cream, 1 tablespoon sugar
Serve with a dollop of whipped cream, fresh raspberries, and a mint leaf.
Notes
Frozen raspberries may be used. Allow berries to fully thaw and be certain to use all the juices from the berries.
Use heavy cream or heavy whipping cream, not half and half.
Don't overwhip the mousse. Whip just until the beaters begin to leave a pattern in the mousse.
Refrigerate until chilled.
Add a dollop of whipped cream and any garnishes right before serving.
Store mousse covered in the refrigerator for 3-4 days.