Rational AG engages in the development and production of professional cooking appliances for industrial kitchens. It operates through the following segments: Rational and Frima. The Rational segment concentrates on cooking processes in which heat is transferred 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.