
Put on a high heat. Send onions, carrots, bay leaves and peppercorns to a saucepan. At the time of boiling, dense foam forms, remove it with a large spoon (if the foam is not removed, then the broth will become cloudy). Salt to taste. Reduce the flame to the minimum and cook the knuckle under a closed lid for about 2-3 hours. Focus on the fact that the knuckle will become soft.