Schwenker

Schwenker is a local term from the German state of Saarland, the Mosel Valley and big parts of Rheinland Pfalz and is used in three ways, all relating to the same grilled meat:
Grilling is done over an open beech wood fire. Charcoal is sometimes used, but that is regarded as sub-standard because the beech smoke is considered to be an important part of the process. Gas-fueled grills are never used (except in commercial snack bars).
Beside the Schwenker, sausages (German bratwurst and French merguez), different vegetables (such as bell peppers), Brötchen (German bread rolls German cuisine), baguette (French type of bread) with garlic butter, potatoes and feta cheese (the latter three protected in aluminium foil) may be grilled.
Various side salads (usually a pasta (typically fusilli or spiralini) salad, a potato salad and a green salad), and baguette or Flutes are served with Schwenker. Many prefer specific beers, such as a pils by one of the local breweries, with their Schwenker.
Brief history.
Legend has it that this style of cooking came to the region from South America. The region's Agate cutters had to travel further afield for their supplies as the local deposits became worked out in the early 19th Century and it is said that they enjoyed the Churrascaria they found in Brazil. The main similarity is that large chunks of meat are cooked over an open fire and served with vegetables.
The process of grilling the Schwenker is known as "“Schwenken”", which not only describes the grilling process itself but also the social event which surrounds the grilling activity. In Saarland one would not be invited to a "barbecue", but would instead be invited “Schwenken”.
Related dishes.
In the nearby Hunsrück district of Rhineland-Palatinate, the local speciality Spießbraten is often served along with or instead of Schwenker. Raw meat, most usually pork neck or loin but sometimes also beef is marinated in a mixture of onions, salt and pepper for several hours. The meat is then roasted over an open beech log fire and served with potatoes and grated radish or seasoned cabbage. This is carried out in a similar manner to Schwenker, on a large grill resembling a wheel hanging down above the fire. The wheel is rotated slowly over the fire to ensure even cooking. 
A dish beyond borders.
Swinging grills and the aforementioned cuts are gaining popularity. If it's true that the Germans brought it from Brazil, it's also true that Americans brought it back to the U.S. 
It is popular at beer festivals and other outdoor events and is also served in local restaurants, frequently accompanied with bratkartoffeln (sliced fried potatoes), onions and sweet cucumber.
For many years the town of Idar-Oberstein hosted an annual Spießbraten Festival.