The term One-way-grill is actually a very bad 1:1 translation from German.

So here are the right namesGerman – Einweggrill* UK - disposable instant grillUS - disposable barbeque (BBQ)French – grill á usage unique Suomi - Kaksi kertakäyttögrilliä Finish - ?

* Wegwerfgrill, Picknickgrill, …

https://www.kmmatch.com/media/catalog/product/0000365_large.jpg

It seems to be used worldwide. In Europe, the USA and even in China.

http://best-b2b.com/Search/?keyword=instant+grill&search=

The base of the disposable grill is made of thin aluminum. That pan holds about 500g of charcoal – enough to grill up to six steaks, saussages, chicken parts, etc.

To hold the meat over the glowing charcoal, the aluminum pan is covered by a thin metal grid.

In Germany the disposable grill is sold at gas stations, in beverage-markets, supermarkets, depots for gardening & building.

At a price of about 2,50 Euro it is a simple convenience product that is placed eigter next to the big bags of charcoal or next to beer or packs of ready made steaks sealed in pastig bags.

http://www.grillsportverein.de/upload_neu/2006/05/einweggrill_flash.jpg

http://files.tradoria.de/a3ae7f0aacb602cc12f1be609bb4aa21/images/141375641_401038.jpg

There are also some boxes, that contain disposable plates, cutlery etc.

Who uses it?

In Germany there are 3 different user-groups:

Group 1: Mostly young people that spontaniously decide to BBQ in nature (a park, beach etc.). They buy a sixpack of beer, one pack of ready made steakes or saussages - and a disposable grill.

http://www.fensterzumhof.eu/bilder/d/38649-6/Grillen-Parks-Berlin-Tiergarten

Group 2: People that do have a big grill at their home, but do not like to carry it to a place outside (parks, camping, festivals)and also do not want to take a dirty grill back.

http://www.boker.de/images/treetimes/tirpitz/gross/05.jpg

http://www.osgc.de/blog/wp-content/uploads/2010/04/einweggrill_1.jpg

And group 3: People that live in small apartments (may be with a small balcony) and do not have the space to keep a grill around there.

Who produces it?

Companies that deal with carcoal, for instance the „Holzkohlewerke Lühneburg“ Germany (holzkohlewerk.de)

Companys dealing with all kinds of BBQ grills, for instance „Landmann“ Germany (landmann.de)

And of course the Chinese, for instance „Xinrui“ (pictures link)

http://www.alibaba.com/product-gs/247097684/one_way_Grill_bbq_grill.html

That is a producer from Spain (selling importet Argentine products)

http://www.deliargentino.es/prDet.aspx?ProductID=102&n=BARBACOA_INSTANTANEA