Cut a small piece from the rested pasta dough, keeping the remaining dough covered to prevent it drying out.
Flatten the dough slightly, then pass it through the widest setting on the pasta machine. Fold into thirds and pass through again. Gradually reduce the settings, rolling until the pasta is approximately 1mm thick.
Lay the pasta on a lightly floured surface and cut into squares approximately 6cm wide. Work with a few squares at a time, keeping the rest covered so they stay soft and easy to seal.
Place approximately ½ tsp of your prepared filling in the centre of each square. Avoid overfilling, as this makes the tortellini difficult to seal.
Fold one corner over to meet the opposite corner, forming a triangle. Gently press around the filling to remove any trapped air, then firmly seal the edges. If the pasta feels dry, lightly dampen the edges with a little water before sealing.
With the triangle’s point facing upwards, bring the two bottom corners together around your fingertip. Overlap the corners slightly and pinch firmly to join, creating a small ring. Gently ease the tortellini off your finger.
Place on a lightly floured tray in a single layer, leaving space between each piece. Repeat with the remaining dough and filling. Refrigerate if you are not cooking them straight away.
Bring a large pan of salted water to a gentle boil. Add the tortellini in batches and cook until the pasta is tender and the filling is cooked through. Lift out carefully using a slotted spoon and gently combine with your sauce, adding a splash of pasta cooking water if needed. Serve immediately.