Butternut Squash and Hazelnut Lasagne with cream

5 1/2 cups chicken stock or 5 1/2 cups vegetable stock or 5 1/2 cups canned broth 2 tablespoons unsalted butter 1 large onion , chopped 1 butternut squash,[...]

1/3 cup heavy cream 2 tablespoons finely chopped toasted hazelnuts salt & freshly ground black pepper, to taste 2 tablespoons unsalted butter 1 yellow onion ,[...]

1/3 cup heavy cream 2 tablespoons finely chopped toasted hazelnuts salt & freshly ground black pepper, to taste 2 tablespoons unsalted butter 1 yellow onion ,[...]