Sorry, my use of volume as serving example may have confused things.I think we can agree that when we’re talking about the relative price of one foodstuff we’re substituting for another, the cost-per-serving is most relevant. So at the prices you specify, for it to be true that frozen raspberry spread is cheaper as a substitute for jam, you’d have to be able to use at most 2.75/4.39 = ~60% as much raspberry spread as you would jam (by weight) in a given application.Your footnote seems to suggest that raspberries are clearly cheaper because jam is only 40% raspberries, so 40% as much raspberries (by weight) equals an equivalent serving of jam. I don’t have a great sense of whether the raspberries on your waffle weigh 40% as much as you would have otherwise used in jam, but I’d probably bet that it’s closer to 60%.So I guess my (small) gripe is that I suspect that frozen raspberry spread is somewhere closer to equal to the cost-per-serving of jam vs. obviously cheaper. Or maybe my I’m quite bad at eyeballing the weight of mashed fruit.Regardless of cost, I like this idea for the other benefits and it sounds tasty!
I’m trying to understand the “cheaper” claim. You seem to be saying it’s cheaper on a percentage of fruit basis. But wouldn’t the more relevant comparison be cost per serving? Ie. Is a Tbsp of smashed raspberries cheaper than a Tbsp of jam?