Pop your potatoes on to boil for around 20-30 minutes until soft.
Blitz the onion in a food processor.
Add the butter and onion to a large saucepan and sweat for a few minutes until soft.
Add the vinegar and cook for a minute or 2 then add the flour to make a paste.
Very slowly add the stock, whisking as you do so. Add the parsley, squeeze of lemon juice and peas and simmer for 5 minutes.
Steam your broccoli florets.
Remove sauce from heat then stir through the cream.
Return to heat, bring to simmer , drop the fillets in and simmer for around 4-5 minutes or until cooked all the way through.
Mash your potatoes with a splash of milk.
Serve with the mash and broccoli
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