Gnocchi with Tomato and Mushroom

Name: Gnocchi with Tomato and Mushroom
Ingredients: For the Gnocchi; 450 grams potato; 160 grams plain flour; 1 pinch sea salt flakes; 30 grams finely grated parmesan; 1 egg; For the Sauce; 50 grams butter; 2 tablespoons olive oil, plus more for drizzling; 1 onion, diced; 3 cloves og garlic, finely minced; 2 sprigs of fresh oregano; 3 portobello mushrooms, chopped chunkily; half teaspoon chilli flakes; 5 sundried tomatoes, chopped; 3 tablespoons tomato puree diluted in 150 ml of boiling water; 1 handful basil leaves