Creating this Fresh Raspberry Tiramisu is straightforward if you follow these easy steps:

1. Prepare Raspberries: In a bowl, gently toss the raspberries with lemon juice and set aside.
2. Combine Coffee and Liqueur: Mix the cooled brewed coffee with coffee liqueur (if using) in a shallow dish.
3. Whip Cream: In a separate bowl, whip heavy cream until soft peaks begin to form.
4. Mix Mascarpone: In another bowl, combine mascarpone cheese, granulated sugar, and vanilla extract. Stir until smooth and creamy.
5. Fold in Whipped Cream: Gently fold the whipped cream into the mascarpone mixture until fully incorporated. Take care not to deflate the cream.
6. Soak Ladyfingers: Quickly dip each ladyfinger into the coffee mixture, ensuring they soak but do not become soggy.
7. Layer Ingredients: In a rectangular dish, place a layer of soaked ladyfingers on the bottom. Spread half of the mascarpone mixture over the ladyfingers, and top with half of the raspberries.
8. Repeat Layers: Add another layer of soaked ladyfingers, followed by the remaining mascarpone mixture and the rest of the raspberries.
9. Chill: Cover the dish with plastic wrap and refrigerate for at least 3 hours to allow the flavors to meld and the dessert to set.
10. Serve: Before serving, dust the top with cocoa powder and arrange additional fresh raspberries on top for garnish.