Top 100 Five-Ingredient Dinners

Can this be made in advance and reheated?

I have made this cake 6 times now for birthdays and Christmas. Everyone who tastes it says it's a MUST for any occasion! With Greek heritage in my husbands' family, this is a hit. Family and friends love it. I forgot to put the orange zest in this last cake - I'm wondering if anyone has a suggestion for incorporating the zest in the syrup. Oops!