Pour 3 cups of water with a little salt into a wide pot. Before it boils, sprinkle in the flour and immediately blend smooth with an immersion blender so it does not get lumpy.
Cook over medium heat, stirring constantly with a wooden spoon, for about 15 minutes, until the flour thickens into a smooth mass that pulls away from the sides of the pot.
For the broth, fry the dried pepper in oil, puree it with 1 cup of water using an immersion blender, and set aside.
In the same oil, sauté the onion, add the tomato, and make a quick sofrito.
Add 5 cups of water, and when it boils, add the whitebait, the roasted pepper strips, the pepper puree and the cumin.
Season with salt and simmer gently for about 15 minutes.
To serve, put some of the thick porridge on each plate and pour the hot, paprika broth over it.