Place the ricotta in a fine-mesh sieve and let it drain for 15 minutes to remove excess moisture for a better dough consistency.
In a medium bowl, combine the drained ricotta, egg white, grated parmesan, cassava flour, sea salt, black pepper, and nutmeg.
Stir the mixture gently until a soft, uniform dough forms; avoid overmixing to keep the gnocchi light.
Lightly dust a clean surface with a tiny bit of extra cassava flour and roll the dough into long ropes, then cut into 1-inch pillows.
Bring a large pot of salted water to a gentle boil and drop the gnocchi in, cooking until they float to the top, which takes about 2 to 3 minutes.
While the gnocchi cook, melt the ghee in a large skillet over medium heat and add the sage leaves, frying them until they are crisp and the ghee smells nutty.
Use a slotted spoon to transfer the gnocchi directly from the water into the skillet, adding the baby spinach at the same time.
Toss everything gently for 1 minute until the spinach is wilted and the gnocchi are coated in the fragrant sage butter.