Place the eggs in a pot and cover them with water. Bring the water to a boil, then remove the pot from heat, cover it, and let the eggs sit for 12 minutes.
Drain the hot water and run cold water over the eggs until they cool. Peel the eggs and slice each one in half lengthwise.
Scoop the yolks into a mixing bowl. Add the mayonnaise, mustard, salt, and black pepper. Mash and stir until the mixture is smooth.
Spoon or pipe the yolk mixture back into the egg white halves.
Press one green olive into the center of each filled egg half so the pimento faces upward.