Note
1. If using an Ooni, fire up your oven and preheat to 177 °C.
2. Place the capsicums on a baking sheet, rub them all over with olive oil, sprinkle with salt and spread them out in a single layer.
3. Roast the capsicums for about 30 minutes, turning them occasionally, until their skins are wrinkled and slightly charred in places.
4. Remove the capsicums from the oven and set aside to cool to room temperature.