Heleo

I’m from the UK which means there are no presto pots here. I was wondering if anyone can suggest an alternative or tell me what I should be looking for. I plan to do some candle-making with my mother and since she has a new cooker and new pans she's all "not on my cooker" (not that I blame her). I read about the presto pot here. But we don’t have them for sale in the UK. Can anyone suggest an alternative, please? Or let me know what I should be looking for in an alternative since I’ve no idea really what a presto pot is usually meant to do. Thanks.