Boil the eggs for about 11 minutes, or until they are hard. Remove the eggs from the pan and plunge them into a bowl of icy water until they are cool.
Peel the eggs and place them in a food processor along with the quark, white wine vinegar, mustard powder and a bit of salt and pepper. Blitz for a few seconds until the eggs are finely chopped and blended well.
Cut 12 slices from the olives. Then cut 12 small triangles (for the fangs) and 12 small cubes (for the eyes) from the pepper.
Lay 6 of the bread discs down, then spread some of the egg mix on each one.
Arrange the carrot strips on 3 of the discs to make legs, then do the same on the remaining discs with the chives.
Place 2 'fangs' at the front of each disc to resemble teeth (a cocktail stick is good for doing this.
Top with the remaining discs of bread.
Take each slice of olive and spread a tiny bit if the egg mixture on one side, then press 2 of them onto the top of each sandwich above the fangs.
Using a cocktail stick pick up each small cube of pepper and place it in the centre of each olive slice.