Gnocchi with herb and mushroom sauce

Name: Gnocchi with herb and mushroom sauce
Ingredients: 1 tablespoon vegetable oil; 1 medium brown onion (150g), chopped coarsely; 2 clove garlic, crushed; 400 gram swiss brown mushrooms, sliced thinly; 1 tablespoon plain flour; 1/3 cup (80ml) dry red wine; 2 teaspoon soy sauce; 2/3 cup (160ml) vegetable stock; 1 tablespoon light sour cream; 1 tablespoon coarsely chopped fresh oregano; 1 tablespoon finely chopped fresh sage; 600 gram fresh potato gnocchi