Melt the butter in a heavy, large pot over medium heat. Add the onions and saute until tender, about 5 minutes. Add the squash and 1 1/2 teaspoons rosemary; saute 5 minutes to coat with the butter and soften. Add the wine and simmer until evaporated, about 1 minute. Stir in the stock, cream and Parmesan. Season with salt and pepper. Simmer on low heat.
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