Drain ricotta well by placing it in a sieve over a bowl for 30 minutes, or press gently between paper towels until dry.
In a large bowl, combine the drained ricotta, the egg, and the grated Parmesan; stir until evenly mixed.
Add 150 g (¾ of the flour) and a generous pinch of sea salt to the ricotta mixture and bring the dough together with your hands until combined.
Flour your hands and work surface with the remaining flour. Turn the dough out and gather it into a ball; if it is too sticky, add a little more flour until soft but not stiff.
Flatten the dough into a disk about 1 inch (2½ cm) thick, then cut into strips roughly ¾ inch (2 cm) wide and gently roll each strip into a rope.
Cut each rope into ¾ inch (2 cm) pieces with a sharp knife and arrange the gnocchi on a parchment-lined baking tray; repeat with remaining dough.
Bring a large pot of water to a gentle boil, add the gnocchi in batches, and cook 1–2 minutes or until they float; remove with a slotted spoon.
Serve the gnocchi immediately with your favorite sauce.