Beat the mascarpone, cream, sugar and lemon juice in a large bowl until stiff peaks. Use either a food processor or an electric mixer.
For each pastry, dip 3 lady fingers in the orange juice and place on a plate. Spread a tablespoon of apricot jam on top. Fill a pastry bag with the cream filling and pipe some of the cream onto the lady fingers in a zigzag pattern.
Slice some strawberries and place on top of the filling. Dip the last lady fingers in the juice and place on top of the pastry, followed by another layer of cream. Just before serving, decorate the tiramisu with the last strawberries.
You can serve the tiramisu right away or put it in the fridge to let the lady fingers soften a bit more, as they should with tiramisu.