Preheat the oven to 190C, 375F, Gas Mark 5
Chop the onions, garlic and carrot into small pieces.
Heat the oil in a pan and gently cook the onions, garlic and carrots until soft.
Add the mince and cook until brown.
Add the tinned tomatoes, beef stock, mixed herbs and Worcestershire sauce. Season with salt and pepper.
Cook for 30 minutes until the mince is cooked. In the last five minutes add the brown sauce and gravy granules.
Whilst the meat mixture is cooking peel and chop the potatoes.
Boil the potatoes in water until they are soft.
Drain the potatoes, add a little butter and mash until soft.
Place the mince mixture into a casserole dish.
Top the mince with the mashed potatoes and place the casserole dish in the oven.
Cook for 30 minutes, until the top is golden brown.