Pain de Mer® The coast, the sea and the salty air are the main ingredients for baking Pain de Mer®. You really don't need more... Pain de Mer® is a unique sourdough bread, prepared with purified seawater from the Oosterschelde National Park. The bread basically consists of only 3 natural ingredients. Seawater, wheat flour from Zeeland and homemade natural sourdough. All the ingredients are from within the region of maximum of 40 kilometers around the bakery, which makes the sustainability of this bread ultimate. In short; a unique Zeeland natural sourdough bread with a fantastic bite and taste!