01 -
Heat the broiler. Place the pepper halves skin-side up on a foil-lined sheet pan and broil for 8-12 minutes, until blistered and blackened in spots. Transfer to a bowl, cover, and steam for 10 minutes.
02 -
Peel away most of the loosened skins, discard the seeds, and roughly chop the peppers. If using jarred peppers, drain them well and chop them.
03 -
Warm the olive oil and butter in a large pot over medium heat. Add the onion and cook for 5-6 minutes, stirring often, until soft and lightly golden at the edges.
04 -
Stir in the garlic, tomato paste, and smoked paprika. Cook for 1 minute, just until the tomato paste darkens slightly and the garlic smells fragrant.
05 -
Add the diced potato, roasted peppers, vegetable broth, salt, and black pepper. Bring to a boil, then lower the heat and simmer uncovered for 18-20 minutes, until the potato is very tender.
06 -
Blend with an immersion blender until very smooth, or transfer carefully to a blender in batches. Return the soup to the pot if needed.
07 -
Stir in the cream and red wine vinegar over low heat. Taste and adjust salt, pepper, or vinegar. Serve hot with parsley, extra black pepper, and a small drizzle of cream or olive oil if desired.