Place your casserole dish over a very high heat and get extremely hot, in small batches, brown off your mince, mashing regularly with a potato masher. Remove once browned.
Add to the pan your diced carrots and give a quick colour off before lowering the heat and adding your onions first, sweating down and then adding your celery to finish at the end.
Add your tomato paste and gently cook out before adding your herb, then soy sauce and Worcestershire sauce
Pour in your red wine and reduce slightly before adding your stock. Place back in your mince and gently cook for 30 minutes to bring together.
Take a pie dish and fill with the mince 2/3rd full and place in the fridge to cool. Meanwhile peel and boil your potatoes
Mash your potatoes with first the butter and then the milk. Finally add in your cheddar cheese and egg yolk and mash in well. This will give the mash a beautiful colour.
Spoon the mash over the mince and top with further cheddar, before placing in a 180°C oven for 35 minutes.