While the eggplant is roasting, make the sauce. In a big heavy-bottomed skillet, heat 1 tablespoon of olive oil, then sauté the onions, bell pepper and garlic, stirring frequently, until the onions start to soften, 3 to 5 minutes. Add in the tomato paste and paprika—stir for two minutes. Pour in the stock, wine, tomatoes, black pepper and herbs. Stir well, then simmer gently until the sauce is thick but still liquid, about 10-15 minutes. Add in the butter beans and stir everything together.