Add the onion to a food processor and beak down into tiny pieces.
Add the butter to a fry pan and melt , add the onion and sweat, cooking very gently for around 5/6 minutes.
Add the cracked pepper and a pinch of salt.
Then add the white wine, bring to a boil and gently simmer for a few minutes until reduced slightly but thick , turn off the heat and add the creme fraiche , then add the bisto powder.BREKHeat though gently then serve with steak and chips.
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