Put salt, pepper, sage/rosemary, and garlic in a mortar and crush it into a spice blend.
Rub the duck legs with the spice blend and refrigerate them for a couple of hours or overnight in a bowl with a lid.
Pat the duck legs dry with a tea towel.
Put the oil in a pot and heat it up at low temperature.
Add the duck legs and cover the pot with a lid.
Let the duck legs simmer over low heat for 3-4 hours.
They must not boil, just simmer gently.
This ensures the meat becomes tender and juicy, not fried crisp.
After 4 hours, take the duck legs out of the pot and place them in a clean and dry bowl that has been scalded with boiling water.
Strain the duck fat and remove impurities.
Pour the clean part of the duck fat over the finished duck legs in the bowl, so they are completely covered in fat.
Now the duck legs can be stored in the fridge for a long time if you do not use them immediately.
Fry the delicious, tender duck legs in a pan with the fat that "clings to them".
The meat is cooked, so it only needs to be fried briefly until the surface is crispy.