Place the strawberries in a blender and blend until smooth. Transfer the strawberry puree, sugar and lemon juice to a sauce pan and bring to a boil, removing the foam when necessary. When the sauce has slightly thickened, remove it from the heat and let it cool to room temperature.
Place the mascarpone cheese in a large bowl and whisk until creamy. Fold in the zabaglione cream and gently mix until combined and refrigerate until ready to use.
Dip each ladyfinger briefly into the strawberry coulis, then place in a rectangular 9-inch baking dish, and continue the process until the whole base is covered with ladyfingers. If necessary, break the cookies to fill the base up.
Spread half of the prepared mascarpone cream gently over the ladyfingers, making sure they're evenly covered. You can use a spatula or large spoon to help you with this.
Repeat the process of soaking the ladyfingers in the strawberry sauce, then layer them over the cream, until is fully covered.
Finally, spread evenly the remaining mascarpone cream on top of the ladyfingers.
Place the strawberry tiramisu in the fridge, and allow to set for at least a couple of hours, or overnight. Decorate with chopped strawberries and serve.
