RotterZwam is a company from The Netherlands that grows Oyster mushrooms. Not that special in itself, but they use old coffee ground and coffee peels to grow them on. They go around Rotterdam, a city in The Netherlands, and pick up old coffee ground from local bars and café’s. What was normally waste, now becomes a fertilizer for delicious mushrooms which they sell to hospitality businesses or directly to consumers. Their latest product is a grow kit for consumers so that everyone can start using their coffee waste and turn it into nutritious food.
The owners have a strong set of believes that made them start RotterZwam. They believe that food should be produced locally instead of being transported around the globe and that coffee grounds should be used for food production, instead of disposing it and last but not least, they believe in growing and consuming mushrooms because it is 25 times more efficient to get proteins from mushrooms than it is from meat.
Reasons enough for them to get started with their business, but they realised that over 70% of coffee is made at home. That is why they developed 'the grow kit' so that consumers can now grow their own Oyster mushrooms at home. It is a bucket made from recycled plastic (the mushroom would 'eat' bioplastic) in which you can add, layer by layer, your used coffee grounds. Anything goes, coffee from the percolator, filter coffee, coffee cups or pads and your espresso machine. All you need are some spores of mushroom culture, coffee grounds and a little bit of love.