Cheesey leek crumble

Serves 2
Prep time 15 minutes
Cooking time 30 minutes
Leeks are quite strong flavoured but when mixed with other ingredients the flavour is softened. Cheese compliments them brilliantly along with the fresh herbs, too.
Ingredients:
1 large leek, washed
1 potato, about 100g
1 medium carrot
4 tbsp crème fraiche
50g plain flour
30g butter, cubed
50g cheddar, grated,
2 tbsp breadcrumbs
2 tbsp mixed herbs, like parsley or chives, chopped