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The internet's a great repository of wonderful information.
I found a great recipe for onion rings:
4 large white Spanish onions
For the coating:
2kg plain flour
500g polenta
Salt and pepper to taste
For the batter:
1ml lager
450g plain flour
20g Cajun spices
Salt and pepper to taste
For the oil
3 litres vegetable oil
Heat the oil in a domestic fryer or cast iron saucepan until it reaches 180 degrees C. Use a thermometer to check it’s hot enough as hot oil is essential to guaranteeing a crispy ring
Slice the onions into 1cm rings – keep the large outer ones and discard the rest.
To make the coating, thoroughly mix the flour, polenta and together in a bowl and season accordingly.
Now make the batter. Pour the beer into a large stainless steel mixing bowl. Gently add half the flour and mix thoroughly with a whisk. Then add the rest of the flour, cajun spices, salt and pepper and whisk thoroughly again until the mixture is smooth with no lumps.
Gently turn each ring in the flour/polenta coating and shake off any excess. Then dip into the batter and plop one by one carefully and slowly into the hot oil. Beware spitting oil!
Fry the rings for approximately 3 mins until crisp. Remove, shake off the excess oil and place in bowl with some kitchen towel. Transfer to 4 bowls or plates. Enjoy as they are or dip into barbeque sauce or aioli.
2 kg. of flour. Yum!