Yes, the noun 'tiramisu' is a common noun, a general word for a type of cake.
A proper noun is the name of a specific person, place, or thing; for example:
Traditional Tiramisu is made with egg yolks and mascarpone, but there are vegan versions available.
Tiramisu is an Italian dessert.
un tiramisu (masc.)
You would usually drink an Espresso with your tiramisu.
Tiramisu is the most popular dessert of Italy. Also, watch the process of making Tiramisu on Youtube where you will get all the information about its history and more interesting things about this.
Ciao Italia - 1989 Tiramisu di moda Trendy Tiramisu was released on: USA: 27 September 2008
common noun
Tiramisu - TV series - was created in 2010.
Common
Common noun
common
Pea is a common noun, and peas is the plural...still a common noun.