Hard-boil the eggs

• Place the eggs in a saucepan and cover with cold water.
• Bring to a boil, then cook for 10 min.
• Transfer to ice water and cool completely before peeling.

Crack and dye the shells

• Gently crack the cooled egg shells all over without removing them.
• Mix the red and blue food coloring with water in a bowl.
• Soak the cracked eggs in the dye for 30 min so the color seeps into the cracks.

Peel and halve the eggs

• Peel the eggs to reveal the spiderweb vein pattern.
• Cut each egg in half lengthwise and remove the yolks.

Make the filling

• Mash the yolks with the mayonnaise, Dijon mustard, apple cider vinegar, salt and pepper until smooth.

Pipe the filling

• Transfer the yolk mixture to a piping bag.
• Pipe the filling into the egg white halves.

Decorate the eyeballs

• Top each egg with a slice of black olive for the pupil.
• Drizzle ketchup over the eggs to create bloodshot veins.