for dough:

1. Place the flour on a clean work surface (or in a bowl). Add the salt.
2. Make a well in the top of the flour and add the egg. Work the egg into the flour
3. Slowly add the water to the flour mixture, mixing it in as you go. Knead dough until smooth. Cover and set aside.

for filling:

1. Preheat oven to 325° F.
2. Add the onion to a frying pan with the olive oil, saute over medium-high heat until translucent, add the garlic and cook for 2 minutes.
3. Remove from heat, add the pumpkin, thyme, cayenne, nutmeg, and pepper.
4. Beat the eggs in a large bowl, stir in cream and add parmesan cheese and the pumpkin mixture. Pour into a greased baking dish. Bake for 45 – 60 minutes, until custard, is set. A knife inserted in the center should come out clean. Cool.

to assemble:

1. Roll the dough out very thin, approx 1/16 inch.
2. Cut into round circles (about 3-inches) using a glass or a cookie cutter.
3. Add a spoonful of the filling to the center of each circle.
4. Fold the dough around the filling, sealing the edges, creating a half-circle or crescent shape
5. When all of the pierogi are filled, bring a large pot of salted water to a boil, cook the pierogi for use a few minutes until they float to the top.
6. Serve with melted butter or saute in butter before serving.