Med-style Baked Potatoes

Heat the oven to 200°C (180° fan) 400°F gas 6.

Prick the potatoes several times with a fork. Rub the oil over the potatoes, then scatter over the sea salt. Place directly on the shelf in the oven and bake for 1 1/4-1 1/2 hours, (depending on the size of the potato) until golden-brown and crisp on the outside and soft on the inside. Split each baked potato in half.

Heat the butter in a frying pan and cook the onion and celery for about 5 minutes, until softened. Allow to cool slightly.