Cook the spaghetti according to the instructions on the packet. Chop the garlic and sauté in oil. Add the thawed and drained spinach leaves and fill up with stock. Over low to medium heat, let the liquid almost boil off.
Add the quartered cherry tomatoes and season with salt, pepper, sugar and a little nutmeg. Let simmer further. When the liquid has almost boiled off, add the cream to taste and remove the saucepan from the heat. Fold in the finely chopped feta.
When the spaghetti is ready, fold the spinach mixture into the hot spaghetti and serve.