After having a left over piece of this cake, my dad requested this cake for his birthday tomorrow. I usually have all these ingredients on hand and it is especially easy because it starts off with a cake mix. It is different than most tres leches cakes because it has a chocolate icing just like Boston Cream Pie. Now if I could only figure out how to get some custard in it. By Rolando Cruz-Taura, Coastal Living, MARCH 2009.