Fine Baden classics & more - Hotel Restaurant Sonne. The Restaurant Sonne is one of the gastronomic landmarks of Gengenbach. In nice weather, two terraces invite you to enjoy hours under the open sky: our old town terrace and our green sun courtyard with southern charm. Our kitchen is appreciated not only by our hotel guests but also by locals who enjoy dining with us. Every dish brings culinary sunshine, whether for lunch or a cozy dinner. Seasonal and regional enjoyment in the heart of the old town with fresh, regional ingredients is the basis for our culinary art.