375g/13oz potatoes (preferably Maris Piper), peeled and cut into even chunks (300²µ/10Β½΄Η³ϊ peeled weight)
1 tsp caster sugar
1 tsp fine sea salt
300²µ/10Β½΄Η³ϊ strong white flour, plus extra for kneading
1 tbsp sunflower oil, plus extra for greasing
1 tsp dried fast-action yeast