I do these as an alternative to stuffed peppers using a sweet variety - vidalia,walla walla, etc and a large enough size to have a 2-3 layer rim and cavity holding about 1/2 cup. I've used meat loaf mix or garlicy chard mixed with ricotta and reggiano or a mix of whatever leftovers might be available. Most recently, added the chopped, browned interiors to some browned pork sausage and leftover wild rice seasoned with some sage and fennel, baked in a bit of chicken stock. Not fancy but satisfying.
Lekker ... ops, I mean tasty. I am starting speaking dutch now
A fiend of mine few made this version for the 26 and we all loved it.
First boiled large white onions, remove most of their inside, chopped, mixed with ricotta and egg white (whip stiffen), pepper, nutmeg, salt. Filled with this mix and baked again .... that is really nice!
Once I get the recipe and try it I will post it!