Potato gratin with dried porcini - JOZO Salt

Ingredients

• 1 kg of potatoes, starchy
• 1 large yellow onion
• 12 g dried porcini or another mushroom
• 2 teaspoon milled JOZO Coarse mill salt
• 0.5 teaspoon coarse black pepper
• 3 dl milk
• 3 dl cream
• 100 g grated tasty cheese, such as parmesan or Swedish västerbotten cheese