Rah-moo-neh
Here's a breakdown:
* Rah: The "R" sound is similar to the "R" in "road."
* Moo: The "oo" sound is like the "oo" in "moon."
* Neh: The "e" sound is similar to the "e" in "bet."
It's important to note that the "u" in Ramune is pronounced like the "u" in "flute," not like the "u" in "but."