Preheat the oven to 150°C. Place the olives in a bowl and drizzle with olive oil. Sprinkle with salt and herbs of your choice. Mix with your hands to coat the olives well with the oil mixture. Spread on a baking tray and bake until the olives are dried and shrivelled, about 1 hour. Use on salads and pizza – they have a lovely nutty flavour.