This was a combination of 2 recipes in Delicious - Tobie's meatballs (and peas) and Jill Dupleix's polenta (not that you really need a recipe for polenta). However, it is a great variation on spagetti and meatballs.
We accidentally bought non instant polenta, but it was still super quick and easy.
There aren't very many meals that are so orange (unless you use a lot of tandoori paste I guess), but we decided to give it ago.
It was quite simple - roast the whole sweet potatoes, scrape out the insides and mash it with onion, garlic, herbs, some egg and taleggio, put the mash back in the skins and bake for 20 minutes or so until "set".
I did serve them with salad because I couldn't face such an orange meal by itself!
As a technique though, I could easily imagine using a potato, or an eggplant, or a small pumpkin if I could find one small enough, and changing the cheese and herbs as appropriate, perhaps with some bacon (if one liked bacon).