Mountain View Linda's Parisian Burger Sauce

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From mountain view ca's much loved burger joint which closed up in the mid 80's. this is for the sauce only. typically, the buns are oval shaped sourdough - grilled, 2 hamburger patties (i use only one), slice of cheddar along with this sauce - warmed. these burgers were always served with tater tots. i love serving this sauce with the fried tater tots too.

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Steps

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Rehydrate dried onion with enough water to cover for at least 1 hour.

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Drain and discard water.

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Combine all ingredients and refrigerate for at least 1 hour.

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Tastes best overnight.

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Keeps well in the refrigerator.

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Ingredients

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ketchup, tomato paste, yellow mustard, celery seeds, black pepper, dried onion