Method
Roast the capia peppers in a 200°C oven or over a gas flame until the skins are charred and the flesh is soft.
Place the hot peppers in a bag for 5 minutes (to steam), then peel off the charred skins, remove the seeds, and roughly chop.
In a large pot, heat the vegetable oil. Add the flour and sauté for 2-3 minutes until the "raw" smell is gone but the flour hasn't browned.
Add the chopped roasted peppers and garlic to the pot. Sauté for a few minutes.
Add the butter and red pepper paste. Sauté for another 2-3 minutes to release the color and aroma of the paste.
Pour in the cold water. Whisk constantly until the soup reaches a boil to ensure no lumps form. Let it simmer for 5-10 minutes .
Use an immersion blender to process the soup until it is completely smooth and silky. Add the red pepper powder and salt.
Pour in the milk while stirring continuously. Bring the soup back to a gentle boil.
Cook for an additional 2-3 minutes after it boils, then remove from heat. Serve hot with crusty bread or croutons.
Notes
Steam the roasted peppers in a covered bowl for 10 minutes to peel the skins effortlessly. Use a high-speed blender to ensure the soup reaches the perfectly smooth and velvety texture mentioned in the title.