Hi VC,
"Red Onions" are very common place here in Manchester and it suprises me that you haven't come across them? With that said, I guess you are more likely to get them with TA pops rather than restaurant pops.
The usual pickle tray around these parts are generally made up of, red onions, sweet mango chutney, chilli jam/sauce, hot lime pickle, mild yogurt sauce and hot yogurt sauce.
I usually eat the lot before my main arrives and struggle to find room for it in the end lol ;D
Ray
