I stumble upon this Shepherd's Pie on someone's blog the other day but I forgot to save the link. The recipe calls for potato, kumara (a red or purple Japanese sweet potatoes), and pumpkin for the base. I quite like the idea of mashing them altogether as they create a pretty color. The filling is ground beef (well I supposed not to eat red meats...but am baking this pie for my brother...hehehe), frozen corn kernel, carrots and peas. I tweaked the recipe a bit by adding pasta tomato sauce for the filling mixture, and cover the top with grated parmesan and cheddar cheese.