Tips for Eggs:
How fresh are your eggs? Put egg in to 4ins. of water, if it stays on the bottom it's fresh. If one end tips up it is less fresh and if it floats to the top it is either bad or at the stage where it will be impossible to fry without breaking.
Hard boiled eggs - To prevent the outside of the yolk turning black, immediately after cooking plunge the egg into cold water and allow to cool down.
To prevent them crumbling when sliced, wet the knife first.