1. In a small bowl combine the chicken, ricotta cheese, lemon zest, thyme, salt, and pepper. Stir to combine.
2. On a dry work surface place 8 wonton wrappers. Place a rounded teaspoon of the chicken mixture in the center of each wrapper.
3. Using a pastry brush, brush the egg wash around the chicken mixture. Bring four corners of the wonton square together over the filling to form a purse. Press the edges together tightly to form a seal. Wipe the board with a towel until dry and continue making batches of 8 with the remaining wonton skins.
4. Meanwhile, bring a large pot of salted water to a boil over high heat. Add
   the purses and cook until they float to the surface, stirring occasionally, about 4 to 5 minutes. Drain the ravioli.
5. Melt 4 tablespoons of butter in a medium skillet. Turn off the heat, add the cooked pyramids and gently toss.
6. Transfer the pyramids to 4 serving plates. Sprinkle with grated Parmesan and sprinkle with salt and pepper. Serve immediately.

Serves 4.