Tam from Vietnam has come to the basement deli of a department store, called a "depa-chika." She's accompanied by her housemate Kaito and his American friend Mike.
To ask the name of something you don't know, point to the thing and ask "Kore/Sore/Are wa nan desu ka." For something close to you, use "kore." For something close to the person you're talking to, use "sore." If the thing is far from you and the person you're speaking to, use "are." "Nan" is an interrogative meaning "what." "Nan/Nani" (What): The "nan" in "nan desu ka" or "what is" has the same meaning as the "nani" in "nani o shimasu ka" or "what will you do?" However, it's pronounced "nan" when it comes before "desu ka."
Someone who treats you will be happy if you use this phrase. You can also simply say "Oishii!"
"Depa-chika," department store basement delis, sell a wide variety of food including ready-made dishes, bento box lunches, desserts, and bread. Sometimes, free samples are available. "Depa-chika" are convenient because you can buy your favorite dishes and then eat them at home or in your hotel room.