In a large pot, melt the butter in the olive oil. Add the shallots and the garlic and cook until tender, about 5 minutes.
Add the sundried tomato paste, oregano and maple syrup. Let the garlic and shallots caramelize for 5 minutes.
Add the tomatoes and salt and cook over medium high heat for 5 minutes. Slightly brown the cherry tomatoes.
Deglaze with the white wine and reduce until almost all evaporated.
Add the fresh cream and white pepper. Cover and let simmer over low heat for 20-25 minutes.
Pour the sauce into the container of a blender. Reduce to a puree at high speed. Set aside.
Preheat the oven to 350°F.
Spread the walnuts on a baking sheet and cook for 8 minutes. Allow the nuts to cool while the pasta is cooking.
Turn off the heat of the tomato sauce and let cool for 10 minutes.
Cook pasta according to package directions.
Mix the cooked and drained pappardelles with the sauce. Garnish with chunks of goat cheese, coarsely chopped toasted walnuts, basil leaves and lemon zest. Sprinkle with fleur de sel and pepper.