700g/1lb 9oz floury potatoes, such as King Edward or Maris Piper, cooked and chopped into cubes
1 onion, chopped
1 tbsp chopped fresh parsley
1 x 340g/12oz tin corned beef, chopped into cubes
1 tbsp Worcestershire sauce
sea salt flakes and freshly ground black pepper, to taste
1 tsp caster sugar
1 tbsp olive oil
poppy seeds (optional)
4 tsp sea salt
sea salt flakes (optional)
sesame seeds (optional)
1kg/2lb 3oz strong white bread flour, plus extra for dusting
splash white wine vinegar
1 x 7g sachet fast-action yeast
50g/2oz unsalted butter
1 free-range egg, beaten
4 free-range eggs