Step 1: Blend all together until smooth. Best to use a ninja or something that can really cut the onions until you cannot see them.
Step 2: The colour of the sauce should be a bright canary yellow, and the consistency is not at all thick, it is quite fluid. I’d probably say it has the consistency of heavy/double cream.
Step 3: It will keep in the fridge for a while but best to freeze most of the batch and keep only what you need in the fridge.
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