“Collecting separately, burning together” was the header for an entire theme section at a specialist conference of Hamburg’s waste resources business in February 2016. The slogan reveals the topicality of the question, which has concerned all citizens who sort their waste, ever since the so-called dual system has been introduced: “Are the valuable materials that I collect separately actually being recycled?” In Hamburg a large part of the municipal waste ends up in the incinerator, including packaging waste with the Green Dot. Before this backdrop, Nana Petzet came up with the idea of building a local incineration plant on the site of the Recyclinghof St. Pauli, following the example of a type of community cooker developed in Kenia: collectively used cookers fuelled by plastic waste. The furnace designed and realised by 9minus8 *art support and Jochen Weber was tested for the first time on a site on the Veddel in October 2017. Kerstin Kuchta from TU Hamburg took exhaust gas samples during the test incineration.