Definitely Shepherd's Pie!
Whiz it together in a food processor and fry some onions, carrots, celery.
Make it up as you go!
I'd throw in some peas, maybe tinned lentils or tomatoes to make it go further. Some worcestershire sauce for flavour? And top with mashed potato or a combo of potato/pumpkin? Dot with butter and bake.
Serve with ketchup.....yummy......
If I wasn't 40 + 1 I would get up off the couch tomorrow and make a roast just so I could have the pie after :lol:
I'm sure there would be plenty of good recipes online.