Into a large mixing bowl add: flour, cocoa, 3 eggs. Using your mixer, start off slowly until ingredients are incorporated. Gradually stream in water while mixer is running and a dough ball has formed.
Once dough is chilled, divide into 4 pieces. Using a pasta machine, one at a time, roll out each piece from the widest to the thinnest setting. Keep remaining pieces covered and in refrigerator until ready to use.
To assemble: Lightly dust clean work surface with flour. Place one pasta sheet on the work surface. Place a teaspoon of filling every 3 inches down the pasta sheet. Fold the dough over, and press around filling to seal.
Using a 2" ravioli cutter (or pastry wheel) cut out ravioli. Set ravioli on a baking sheet lined with a silicone mat or parchment paper. Continue with remaining dough. Refrigerate until ready to cook.
To cook the ravioli, bring water and 2 tablespoons of sugar to a boil in a large pot. Add ravioli (do not crowd pot, do this in batches). When pasta floats to the top leave it for an additional 2 minutes or until al dente.