Beat the olives lightly with a meat tenderizer, then place in a glass container and pour in water. It is best to weigh the olives with a plate, as they like to float on top.
Changing the water every day is very important.
After four weeks, test whether they still taste bitter,if so, continue until they are edible.
Now, soak them for another week with seven tablespoons of salt to one liter of water. All of the olives must be covered with salt water. Only after this process can you marinate them.