Once the leaves have just wilted, lower the heat to medium, pour in the sauce and keep cooking and stirring everything together for another 30-60 seconds.
Transfer to a bowl using a blotted spoon to get rid of the excess liquid.
Serve warm.
Notes
If you don't have fresh ginger and/or whole nutmeg, you can use 2/3 tsp each powdered spice.
If you prefer to keep it diary free, fry ginger in a little butter and oil in a large frying pan. Stir in ground nutmeg and spinach leaves, cook until they wilt ans season with a pinch of salt.
The reason why we use a combination of butter with oil is the following: spinach pairs better with butter, but because we cook it over high heat, butter alone may burn. That's why we add a little olive oil. In cases like this one, clarified butter is an ideal solution.