Place spinach leaves into a colander and rinse well under cool running water. Drain lightly.
Heat a large frying pan over medium heat. Add the spinach leaves and cook, stirring often, until wilted and bright green in colour. (No need to add any water as there should be enough water still on the leaves from washing them).
Transfer spinach immediately to a bowl filled with ice cold water to stop the cooking process. Once cooled, drain and squeeze out as much excess water as possible. Transfer to a chopping board then roughly chop.
Place the spinach into a bowl. Add the ricotta, parmesan, egg, salt, pepper and nutmeg. Mix until well combined.
Lighlty dust a tray with semolina. Working with one wonton wrapper at a time, spoon a heaped teaspoon of filling mixture onto one side of the wrapper in an oblong shape. Using lightly wet fingers, run your finger around half of the wonton wrapper. Fold the wrapper over and press well to seal, making sure to expel any air bubbles. Transfer to the tray and repeat with remaining wrappers and filling.