In a hot saucepan, melt the unsalted butter in the olive oil, and add the carrots, onion, celery, and chili peppers. Cook the ingredients over medium heat, until they are soft. Add a sprig of rosemary. Add the ground beef and pork, and cook until golden brown. Remove the rosemary sprig, and add the white wine. Let the wine reduce. Add the 'tomato sauce or La Salsa di 5 Minuti, and let simmer on low heat for 1 hour. Before serving, add basil leaves and salt to season. Serve immediately.
Heat the olive oil in a saucepan and add the onion, garlic, and chili peppers. Gently fry ingredients together, about 5 minutes. Add pureed plum tomatoes to saucepan. Simmer on low to medium heat for 10 minutes. Season with salt, to taste. Add basil leaves at the very end.