Dunk the ladyfingers in cold coffee and stack them in a bowl.
Whip the mascarpone, powdered sugar, and heavy cream with a hand mixer. Spread a thin layer of the mixture over the ladyfingers in the bowl.
Cut the strawberries into thin slices and put them on the mascarpone cream. Now alternate between adding layers of cream and strawberries before refrigerating the bowl for 1 hour.
Flip the bowl over and use an offset spatula to spread the mascarpone cream over the entire cake. Use a hot spoon to create small steps with a hollow all around and fill them with strawberry syrup. Garnish the tiramisu with a few fresh mint leaves and a rose made from thin strawberries slices.