Cheers for correcting my errors George.
I don't think the pastry shape is that important and if you were to use any shape to encase your samosa it would be fine. There are many examples of samosas being different shapes from the traditional triangular shape we are familar with. Nor do i think the pastry makes any difference to the taste of the filling, other than the two go well together, kind of complimenting one another adding to the overall pleasurable experience of eating the snack.
Regarding filling, i've looked at many many recipes for the spicing of the filling and in the main they comprise of basically the same ingredients but with varying proportions. I think it's really a case of starting with a base mix and then tweaking where you think necessary until you end up somewhere close to where you want to be. Basically trial and error i'm afraid.
The basic spices seem to be:
coriander, cumin, chilli powder, garam masala. More traditional recipes tend to also add amchoor (dry green mango) powder. Chilli powder is sometimes replaced by crushed chilli flakes. Some include dried meethi leaves as well. Turmeric seems to be added in only a few recipes though.
A small amount of fried onion seems to be popular, having spiced the oil with cumin seeds, as does adding ginger rather than garlic / ginger. Fresh green chilli seems to be the norm with the red chilli powder being adjusted to compensate for the overall heat effect. The addition of chopped fresh coriander is also not unusual and in one or two recipes dried pomegranite seeds are also added (the dark variety which are quite tart rather than the red ones).
Not sure whether any of this helps very much. I think the only real way to make progress is by spending some time in the kitchen experimenting. I can think of worse things to be doing though. Just think of all those samosas you get to eat into the bargain
