1 tablespoon vegetable oil
500g minced lamb
1 stick of celery finely sliced
1 carrot, diced
Green tops from a bunch of spring onions, finely sliced
A heaped teaspoon plain flour (note: a small quantity of wheat flour such as this is fine)
1 tablespoon tomato purée
100ml red wine
200ml water
The leaves from 4 sprigs of fresh thyme
1 heaped teaspoon English mustard (check the ingredients to ensure there are no high FODMAP additions, I used co-op own brand)
Salt and pepper to season
For the mashed potato topping:
1kg potatoes (suitable for mashing), peeled and quartered
50g butter
50-100ml milk (normal milk should be fine as the dish should feed 4 people but use lactose free milk if you think you'll take a larger portion)
Pinch of grated nutmeg (optional)
Salt and pepper to season