Peel cooled hard boiled eggs. Slice in half long ways.

Put egg yolks in a bowl and mash well.

Mix in mayonnaise and mustard. Mix well.

Stir in green food coloring until you achieve your desired color.

Spoon or pipe green filling back into the egg halves.

Place one black olive slice on each egg half.

Dip a toothpick into red food coloring. Draw veins on the egg halves as in photo.