Method
1. Add avocado, white flour, egg and salt to a clean medium bowl and mix with a wooden spoon until they come together
2. Turn out onto a floured work surface and knead for five minutes, adding more flour frequently to keep it from sticking
3. Form into a ball, wrap in plastic wrap
4. Chill the dough in fridge - 30 min
5. Add parmesan cheese, nutmeg, lemon juice, ricotta cheese and salt & pepper to a clean small bowl
6. Stir until completely mixed
7. Transfer filling to large resealable plastic bag with a 1/4-inch hole cut from one corner
8. Chill in fridge - approx 10 min
9. Divide dough into halves and take one half and keep the other one covered
10. Pass it through a pasta machine or roll out manually until it is 1/16-inch thick
11. Cut the sheet in half to make 2 long pieces of dough
12. Line a clean baking sheet with parchment paper
13. Dust with white flour
14. Place the pieces on a baking sheet
15. Using a 3 1/2 inch cookie cutter, cut out as many circles as you can
16. Use the pastry bag to squeeze rings of filling 1 1/2-inches in diameter onto the other half and top with a second ring
17. Fill with egg yolk carefully
18. Uncover the other rounds and lightly wet their edges with your finger. Pressing and stretching to fit, set dough rounds atop each raviolo, moistened side down. Seal the edges by gently pressing them down
19. Cover with a kitchen towel and repeat process with the other half of dough
20. Bring salted water to a boil in a large pot
21. When it boils, gently slide the ravioli into the pot. Boil for two minutes – no more, or the yolks will cook
22. Remove to a plate and serve in shallow bowls drizzled with sriracha, topping the ravioli with chile flakes and parmesan