Link from Japan Probe
The bath, shaped like a ramen bowl, contains pepper-flavored water colored a light, milky brown, to like tonkotsu (pork bone) ramen soup. The special bath was created jointly by the theme park and a famous ramen shop, Nantsuttei in Hadano, Kanagawa Prefecture.
The bath was completed at the unveiling event, with the owner of Nantsuttei adding “noodles” made of bathwater additives into the tub.
The water contains collagen and garlic extracts, and theme park officials claim it can help produce beautiful skin and aid moisture retention.
“The aroma of pepper is said to have the effects of refreshing your mind, warming your burned-out heart and inflaming your passion,” explained a statement by spa complex Hakone Kowakien Yunessun in Hakone, one of Japan’s most popular hot spring resorts.
Ramen lovers in bathing suits turned into ingredients in the broth, jumping into the three tubs shaped like ramen bowls underneath noodle decorations hanging over their heads.
There is a Youtube video too, link
There are also green tea, coffee and red wine themed baths, I would not mind trying these just for the heck of it.