Leftover Pot Roast- Cruets

A reader asked a question about our favorite leftover pot roast recipe. We're not in pot-roast land right now--not sure why, but big hunks of meat haven't been calling us. In any case, pot roast is an easily traveled dish, and there's no reason to heat it up again as is.

That said, there is one leftover preparation that we prefer more than any other. One of our mothers used to make it. She called it "cruets" which has to be wrong, but the taste is right, so we'll hand it to her. No pix, because we haven't made it recently.

Cruets

4 hoagie rolls, the best you can find. The shape is what's important here: they should be about six inches long.
1-2 cups leftover pot roast, shredded
leftover gravy
1 cup cooked potatoes (best if boiled and diced)
1 cup carrots, diced
1 cup onions, diced
1 cup celery, diced and peeled
(obviously proportions will vary based on the size of your rolls and amount of meat you have left over)
olive oil
butter

1. Heat an oven to 275.
2. Cut the top 1/4-1/3 off of each roll, and hollow out to make a boat.
3. Place boats and lids in oven and cook for about 30 minutes or until very hard.
4. Put 2 tbsp oil in hot pan, add a sliver of btter and the potatoes.
5. Don't move the pan until one side is browned, then flip, brown another side, then remove.
6. Add more oil and butter, the onions, carrots and celery to pan and cook over medium low heat until al-dente.
7. Add the leftover meat and potatoes back in and toss. Season with salt and pepper if necessary.
8. Warm the gravy.
9. Remove the rolls from the oven.
10. Place rolls on plates, putthe hash mixture inside, pour in some gravy, and top with a lid.
11. Serve immediately with butter, yesterday if possible.