Wild Mushroom, Watercress And Blue Cheese Tart Recipe

Ingredients

• 1 pound mixed wild mushrooms
• 2 tablespoons olive oil
• 1 scant cup watercress leaves
• 3 1/2 ounces Picos blue cheese
• 1 1/4 cups heavy cream
• 4 extra large free-range eggs
• sea salt and freshly ground black pepper
• 1/2 cup walnut pieces
• 1 3/4 cups all-purpose flour
• 5 tablespoons chilled butter
• 4 tablespoons chilled lard