Mushroom and Celery Root Galette W Mushroom Sau

Yield: 4 Main-dish
Categories: Sauces, Pastries, Vegetables
NORMA WRENN
1smCelery root (3/4 lb)
2mdLeeks
1lbWhite mushrooms
3tbOlive oil
1lgOnion; finely chopped
1Lemon; halved
1/2tsDried tarragon
Salt/freshly ground pepper
2mdGaric cloves; minced
1/4cFresh flat-leaf parsley
+ more for garnish; chopped
Mushroom Sauce
1/2cCreme fraiche or sour cream
2tbFreshly grated Parmesan or
Asiago cheese
Yeast Dough or Pie Dough
1lgEgg; beaten
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