Combine flour, cocoa and eggs in food processor until fully incorporated.
Slowly stream ⅓ cup (75 ml) water into the mix – while running – until dough comes together. You may not need the whole amount of water.
Knead dough until smooth, wrap tightly in plastic wrap, allow to rest for 1 hour.
Roll dough as thin as possible – about 1/16″ of an inch. Having a pasta machine for this is handy, but it can be rolled with a rolling pin… and a bit of patience!
Use a round cookie cutter or rim of a glass – 2.5 – 3″ or so – to cut rounds from the dough.
Mound 1-2 teaspoon (5-10 ml)of filling into the middle of a round, top with another round.
Carefully seal the edges by running a wet finger around the inner edge of a round, then pinching the edges together around the entire seam. Alternatively, use a ravioli or pierogi maker.
Bring a large pot of water to a boil. Gently add ravioli to boiling water, one at a time, about 6 to a batch. Ravioli has finished cooking when they float to the surface of the water.
Use a slotted spoon to remove cooked ravioli from the water, dip in cool water to halt the cooking process.
Serve warm or cold, dusted with powdered sugar or drizzled with sauce.