In Japan we have a long bank holiday weekend on May, called Golden Week
.
This year 2009, I had 5 days off in a row from 2nd to 6th of May. Some other people had longer one adjoining another weekend or another bank holiday 29th of April.
Anyway after the long holiday, it is likely that Japanese people exchange a box of sweets from their holiday destination each other. That is called "Omiyage"(お土産, souvenir). Therefore everywhere in major tourist sites when we travel across Japan, we are able to find box of local sweets suit for Omiyage at hotels airports and souvenir shops etc.
Rokkatei (六花亭) is one of the most popular sweets house in Hokkaido （北海道), the north land. Dairy products are specialities of the region and sweets with cream, butter from Hokkaido must be good quality ones.
The most-well-known product by Rokkatei , I believe, is "Marusei butter sand"(マルセイバターサンド). 
The name "Marusei" came from the butter producer name used for the sweet. Rich butter cream mixed with dried raisin is sandwiched with two pieces of biscuit.
If you have one, you must become a fan
of it!
White chocolate made from fresh milk of Hokkaido is another speciality of the house.
According to the company, they are the first producer of white chocolate in Japan from 1968.
Not only the tasty chocolate is, the package is also the reason why this is highly appreciated as Omiyage from Hokkaido. Each flavour chocolate has different illutst of local spieces of flowers. 
Another choice for Omiyage could be this box with two flavours mixed; white and strawberry. Two kinds of flower are depicted on the wrapping paper and each piece of chocolate is shaped in the flower petals.
Rokkatei shops are located only in Hokkaido region. In Tokyo occasionally the productes are available at major department stores and supermarkets, otherwiese it is sold through online shop. We do not have many chances to get the good chocolate products. That is why we are very happy when we get Rokkatei products as Omiyage from Hokkaido.
Rokkatei website: http://www.rokkatei.co.jp
六花亭マルセイバターサンド【10個入】 【0428_GWレビュー】
六花亭の人気チョコレート！六花亭 ストロベリーチョコ ホワイト【0428_GWレビュー】 
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You can get Rokkatei in USA at: http://www.guidea.com/Rokkatei
Posted by: Kei | 17 January 2013 at 14:23
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Posted by: online shopping | 31 December 2012 at 17:07
Hi Zoe, thank you for your comment.
I checked Rokkatei website, at least what I can know there are...
Used: flour, white chocolate, butter made from 100% fresh milk, raisin, egg, soybean
Not used: gelatin, beef, pork, chicken meat
Trust this information is useful for other visitors.
Best regards,
About food in Japan site owner
Posted by: About food in Japan site owner | 21 February 2010 at 17:24
Hi there. I find your website very useful. I have a question to ask and I hope you can help me. I went to the Rokkatei website and its all in Japanese. I need to know if the the Marusei Butter sandwich is suitable for Vegetarians? I can consume milk and eggs but cannot take meat or other substances (e.g. gelatin, lecithin) of animal origin. Do help me check and do get back to me at [email protected] Thank you so much and God Bless!
Zoe
Posted by: Zoe Khoo | 21 February 2010 at 07:54