- food colouring
- Prepare hard boiled eggs.
- Crack the shell but do not remove it.
- Place eggs back in the pot and simmer for 30-40 minutes in the same water water with addition of food colouring.
- Let them cool down before peeling.
Those eggs are great for Easter, instead of traditional eggs.
They would also make fun lunch box item.
For more traditional look try soy sauce or black tea to colour the eggs.
You could also use natural colourings such as beetroot juice.