Shepherd's Pie

4 tbsp olive oil

2 lbs round steak mince

2 rashers, chopped into very small pieces

1 beef OXO cube, crushed

Salt and freshly ground black pepper

25g butter1 onion, diced

3 carrot,s diced

1 parsnip, diced

1 stick of celery, diced

1 garlic clove, crushed

60ml white wine (optional)

1 tbsp self-raising or plain flour

2 tbsp Worcestershire sauce

1 tbsp freshly chopped thyme

1 tbsp freshly chopped parsley

2 tbsp tomato purée

1 bay leaf

Handful frozen peas

¾ - 1 pint chicken stock  

For the potato topping:

7-8 medium-large potatoes

50g cheddar

1 egg yolk

40ml warm milk

25g butter