Cook a 1/2 shoulder of lamb in a slow cooker.
Just shove the lamb in and switch to high. 4 hours later pour the liquid (that has come off the meat - you don't put any liquid in to cook) into a bowl to cool.
If you are eating the lamb as a roat then this is the instructions for that. Otherwise skip to the next bit.
15mins before serving take out the lamb and wrap in foil to keep warm. boil a kettle. get a whisk ready.
Sprinkle some flour into the sc, whisk like mad. Start to add water, continue whisking, add your chosen gravy boost, I'm an oxo cube fan rather than bisto powder so I use oxo. Then leave it until ready to serve - you may need to pass it through a sieve due to bits of meat.
OK the following day the bowl with the lamb fat will have settled and separated in to a thick gel on the bottom and white fat on top.
The fat makes fab fried bread.
The gel is the gold of your gravy.
Heat the gel in a pan, you probably don't need the whole amount, it depends on how much gravy you want, rough rule of thumb - get a pan the size of the gravy you want and the gel should be just under an inch in the pan.
Heat the pan, once the gel has melted sprinkle in some flour, work it in with a wooden spoon and then continue stirring as you add the boiling water, add your oxo / bisto powder and keep stirring.
At this point you can add any seasoning, or red wine of your choice, I don't usually bother.
You should now have a pan of gravy.