Wash the peppers, cut in half, remove seed, cut in stripes and spread on a baking tray. Sprinkle with 1 tbsp oil. Bake for about 30-35 minutes until the edges turn brown. Allow to cool to room temperature.
Add grilled peppers and the other ingredients to a food processor. Increase the speed slowly. Mix for a few minutes until smooth and creamy. Scratch down from the edge constantly. Add more water or 1-2 tbsp oil if needed.
Taste and season with salt, lemon juice or tomato paste if desired.
Serve with a sprinkle of olive oil and toasted ciabatta.