Oyster mushrooms and polenta salad

Ingredients

• 100 gram oyster mushrooms
• 1/2 a cup of polenta
• 2 cups of water
• about 30 gram of grated Parmesan cheese
• 25 gram butter
• 50 ml tarragon vinegar (store-bought, or make your own)
• 150 ml hazelnut oil
• olive oil
• 150 gram mixed greens
• a small handful of bean sprouts
• black and white sesame seeds
• pepper and salt to taste