Place flour on a clean surface.
Create a well in the center.
Add eggs, oil, and salt.
Mix gently with a fork.
Knead dough until smooth.
Rest dough for 30 minutes.
Roll dough into thin sheets.
Mix ricotta, Parmesan, salt, pepper.
Pipe ricotta onto pasta sheet.
Create wells for yolks.
Place one yolk per ravioli.
Cover with another pasta sheet.
Seal edges carefully.
Cut ravioli evenly.
Boil ravioli for two minutes.
Melt butter with sage in skillet.
Transfer ravioli to sauce.
Spoon butter gently over top.
Serve immediately with cheese.