Bring water to a boil, remove from heat and let cool. Peel eggs and remove yolks.
Press yolks through a sieve and set aside.
2 Cut the butter into small pieces. Add in the flour, sugar, egg yolks, hard-boiled egg yolks, lemon zest, cinnamon and salt in a mixing bowl. Mix with your hands until the dough holds together and all the ingredients are well blended. Wrap the dough in plastic wrap and refrigerate at least 2 hours. Gather the dough scraps, reroll, and cut out more hearts.