Warm Stilton and Mushroom Galette

Ingredients

• 1 1/4 cups all-purpose flour, frozen in the freezer 1 hour
• 1/4 teaspoon salt
• 8 tablespoons ice cold butter, cut into 12 pieces
• 4 tablespoons sour cream
• 2 teaspoons lemon juice
• 1/2 cup ice water
• 1/4 ounce dry porcini mushrooms
• 1 cup boiling water
• 2 tablespoons unsalted butter
• 6 green onions, white and green, thinly sliced
• 1/2 teaspoon freshly chopped rosemary
• 1/2 teaspoon freshly chopped thyme
• 1 pound cultivated or button mushrooms, thinly sliced
• 4 ounces Stilton or other blue-veined cheese