Don't really have any traditional Good Friday foods. Last year I did go to a Sader dinner though on the Thursday before Good Friday. So, that was traditional jewish Passover food, which was very interesting. It was done with my Non Denominational Christian church group and led by a Messianic Jew.
I was raised Catholic and we could not eat meat, except fish on Fridays during lent, but I do not see that anywhere in the Bible so don't particularly follow that today, although I respect that others do.
Never had hot cross buns, but have heard they are good. And since I like any kind of bread and most sweets I am sure they are.