Norma's Magic Mushroom Latkes

Ingredients

• 12 large potatoes
• 3 medium onions
• 1 pound oyster mushrooms
• 2 teaspoons porcini powder
• 4 eggs
• 5 tablespoons Wondra flour
• 3 teaspoons salt
• 1 teaspoon pepper
• oil for deep frying
• 6 ounces dried porcini mushrooms
• 8 tablespoons unsalted butter
• 7 cups heavy cream
• 12 ounces Parmesan cheese
• 2 1/2 teaspoons kosher salt
• 2 1/2 teaspoons white truffle oil
• freshly ground black pepper
• 4 granny smith apples
• 1 1/2 cups whole cranberries
• 1 cup sugar
• 4 tablespoons clarified butter
• 1 cup apple juice
• 2 cinnamon sticks
• 4 large strips lemon zest
• 8 tablespoons sour cream