It must the grease doing that. You can hardly taste the meat.
Have you tried using keema mutter or similar and making a sausage roll out of that? Yes I know that sounds similar to a samosa but I'm sure we can call it fusion?
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I can't help you with rotis, but Sainsbury's does some excellent chapati and paratha that you cook on a frying pan straight from frozen
http://www.sainsburys.co.uk/webapp/w...l-paratha-400g
http://www.sainsburys.co.uk/shop/gb/...-chapatti-320g