On Bretzelsonndeg in Luxembourg, it is the custom for boys to present their sweethearts with decorated pretzel-cakes. If a girl wants to encourage the boy, she reciprocates with a decorated egg on Easter Sunday. If the pretzel-cake is large, the egg must be large also; a small cake warrants a small egg. The custom is reversed during Leap Year, when girls give cakes to boys on Pretzel Sunday, and boys return the favor with eggs at Easter. Married couples often participate in the exchange of cakes and eggs as well. Discuss
Source: The Free Dictionary