Brown the burger with the onions and drain the grease, let it cool. In a medium pot melt the butter and then add the flour, stir it constantly over medium heat until it starts to turn brown and gives off a slightly nutty aroma. This is a rue. If you do not constantly stir it, it will burn. Next slowly add the stock while constantly stirring to ensure there are no clumps. Add all of the seasonings and let it simmer over medium low heat.
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