Colcannon Ham & Cabbage Pies

Name: Colcannon Ham & Cabbage Pies
Cuisine: European, British
Ingredients: colcannon; 30g butter; 1 large onion, peeled and thinly sliced into half moons; 1/2 head of green cabbage, roughly sliced; 2 tbsp plain flour, plus extra for dusting; 350ml hot chicken stock; Sea salt and freshly ground black pepper; 1 heaped tsp English mustard; 150ml single cream; 400g cooked ham, cut into chunks; 800g floury potatoes, peeled and cut into chunks; 50g butter; 100ml milk; 6 spring onions, finely sliced; Saucepan x 2; Large frying pan