Tsoureki is a light cake traditionally eaten at Easter. It is eaten at other times of the year as well, but the red dyed hard-boiled egg that it is placed in the centre is traditional at Easter.
The cake is nice and light inside, with the mastic creating a light stringiness when you break it into pieces (traditionally you break it with your hands and don't cut it with a knife).
You will find Easter cookies - koulourakia - in all the houses over the next days. They're easy to make and a nice accompaniment for your coffee. You can make them into whatever shape you want, but I have shown the most traditional in the lower photo above.
Eat and Enjoy!