Wash the potatoes, wrap in aluminium foil and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 1 1/2 hours. In the meantime wash, clean and dice the tomatoes.
Peel and chop the onion. Wash basil, dab dry and chop, except for a little bit for garnishing. Peel the garlic and press it through a garlic press. Mix everything with lime juice and season with salt.
Take out potatoes, wrap them from the foil, cut them lengthwise in the middle until 1 cm before the edge and press them apart. Fill tomato salsa into the potatoes and garnish with some basil.