Prepare the Lemon Curd: In a saucepan, whisk together lemon juice, water, sugar, cornstarch, and turmeric. Cook over medium-low heat, stirring constantly until thickened and smooth. Remove from heat and allow to cool completely.
Make the Mousse: In a mixing bowl, beat heavy cream until soft peaks form. Fold in Greek yogurt, powdered sugar, and vanilla extract. Gently mix in the cooled lemon curd until smooth and fluffy.
Prepare the Raspberry Sauce: In a saucepan, combine raspberries, sugar, and lemon juice. Cook over medium heat, stirring occasionally until the berries break down and the sauce thickens. Strain for a smoother texture if desired, then let cool.
Assemble the Dessert: Spoon the lemon mousse into serving glasses, alternating with layers of raspberry sauce. Chill for at least 1 hour before serving.
Serve & Enjoy: Garnish with fresh raspberries or a sprinkle of lemon zest for an elegant finish.