For the salad, thinly slice cucumbers and place them in a bowl.
Mix rice vinegar, sesame oil, sugar, soy sauce, and red pepper flakes. Pour over cucumbers.
Toss well and add chopped cilantro and sesame seeds. Chill until serving.
For tiramisu, mix coffee and vanilla extract in a shallow dish.
Whisk mascarpone cheese, heavy cream, and sugar in a bowl until smooth.
Quickly dip ladyfingers into coffee, layer in a dish, then top with mascarpone mixture.
Repeat layers and refrigerate for at least 2 hours.
Dust with cocoa powder before serving.