Start by tossing the tomato halves in 2 tablespoons of olive oil and season with salt & pepper. Arrange on a baking sheet, cut side up and roast in a cool oven ((150°C/ 300°F/ GM 2) for 1 hour. Leave to cool
Prepare the potatoes – prick them a few times with a sharp knife and bake in a moderate oven (180°C/ 350°F/ GM 4) for 1hr 45minutes. Allow to cool for 15 minutes (but leave the oven on)
Next, quarter each potato and scoop out most of the flesh, leaving a bit behind to allow the potato skin to hold its shape. (Use the flesh for mash or to top a pie)
Brush each quarter of potato skin lightly on both sides with oil, season with salt and pepper and put back in the oven for 5 minutes to crisp up
Top each skin with a generous scoop of pesto, spreading it out as you go. Place 3 halves of tomato on each skin, followed by chunks of the goats cheese. Dollop any remaining pesto over the top
Bake for 10-15 minutes until the cheese begins to bubble
Scatter with the fresh basil leaves and serve immediately