1In a large bowl, mix together all-purpose flour, whole wheat flour, and salt. Cut in shortening until mixture resembles coarse crumbs. Stir in water until mixture forms a ball. Divide dough into 8 pieces, and shape into balls. Cover, and set aside.
2Heat olive oil in a large heavy skillet over medium heat. Saute onion and garlic until soft and translucent, about 5 minutes. Stir in carrot, turnip, potatoes and mushrooms. Add water, bouillon cube, tarragon, salt and pepper. Cook for 15 minutes.
3Preheat oven to 400 degrees F (200 degrees C).
4Roll each pastry ball into a circle, 6 to 8 inches in diameter. Place about 1 cup of filling on one half of each circle. Fold pastry over filling, and pinch edges to seal. Place on baking sheet, and brush with egg.
5Bake in preheated oven for 45 minutes, or until golden brown.