Rational AG engages in the provision of products and solutions for thermal food preparation for industrial kitchens. It operates through the RATIONAL and FRIMA segments. The RATIONAL segment offers combi-steamer technology, which involves transferring the heat during cooking via steam, hot air or a combination of the two. The FRIMA segment focuses on cooking applications in which food is cooked in liquid or with direct contact to heat. The company was founded by Siegfried Meister in 1973 and is headquartered in Landsberg am Lech, Germany.