Prove, originally meant 'to test' (from the Old French - oooh posh! ) just as we 'prove' bread, to make sure the yeast is good. Pudding was a mixture of meat, fruit and spices, a bit like a sausage and sometimes the meat was off.
Love Kirsty/Kirstie, she's the reason my kitchen is fitted out with drawers instead of cupboards. Life changing! (Okay perhaps a tad dramatic but it did make a huge difference.) She can say anything she likes about pudding, I'll share it with her.