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My mother also used to make Shepherds's Pie with left over lamb, using what was left of her delicious gravy. I don't know how she got one joint to stretch so far, we had a roast, then cold with jacket potatoes on Monday, then the pie. We were a family of four, so 12 meals from one joint.
She was a really great cook, my own version isn't nearly as tasty but I've no idea why, I watched her make it often enough. She often added Marmite instead of salt.
Personally I don't like it much when made with fresh mince as opposed to left over roast, bought mince is often very fatty.
The roasting concentrates the flavour in the mince.(Water evaporates off)
My mum used to do this too, she couldn't understand why, when she tried to use uncooked mince, it just didn't taste the same.
I tend to do mine with raw mince, but it does need more seasoning to get the same effect.
