When he was 16, Dutch engineering student Slat was on vacation in Greece, and he started to think about all the rubbish that is pushed onto beaches by water.

Combine the lentils, water or stock, onion, garlic cloves and bay leaf in a large soup pot or Dutch oven. Bring to a boil.

The New water and the Citadel projects are an attempt to embrace water in the Netherlands, which is almost completely composed of wetlands.