How to Make Chicken / lamb / beef (your choice) Stock cubes at Home:

Wash and clean chicken / lamb / beef bones. (Your choice)
Put in a pan with 1 1/2 ltr of water and all above ingredients, bring to a boil and immediately reduce heat to bring the stock to a simmer.
Simmer partially covered at least 4 hours, occasionally skimming off any foam that comes to the surface.

Remove the bones with a slotted spoon or spider ladle, and strain the stock through a fine mesh sieve.cool down completely then pour in ice cubes tray and put them all in freezer when freeze take it out from trays and put them all cubes in food bag and save in again in freezer. Use as your desire.