Corn Off the Cob

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4 tablespoons (1/2 stick) butter

1 small yellow onion, chopped 

1 cup chicken stock, plus more if needed 

1/2 cup heavy cream 

8 ears corn, shucked and kernels cut off

8 ears corn, shucked and kernels cut off 

Salt and freshly ground black pepper

Salt and freshly ground black pepper 

2 teaspoons red wine vinegar