Just made this excellent cake, but substituted the sugar 1:1 for erythritol. Took slightly longer to cook (have made it before with sugar). I can honestly say in 4 months of doing this low-carb thing that this is the first 'substitute' baked good I've made where it actually is just as good as the carb version (and not some keto blogger trying desperately to convince themselves it doesn't taste of cardboard).
This Gluten-Free Orange and Almond Cake is simply sensational! Moist, nutty & with strong orange flavour this cake is also dairy & oil free.
www.joskitchenlarder.com
Take out the 200g of sugar, replace with 200g of erythritol (or xylitol I guess). I didn't make the sugary whipped cream either.
NB it has two oranges in it but you actually lose a lot of the juice when steaming in the microwave. You whizz up the whole thing - flesh, pith, skin and all, so that's not too carby I don't think, plenty of fibre. (I couldn't find any info on how many carbs in an entire orange, including all the bits you don't usually eat.)
Used to make this quite a lot in the early days, it’s a lovely cake but very rich I could only eat a sliver at a time, used to end up giving most of it away as it doesn’t keep well. But like I say a lovely cake
Erythritol is £6.99/kg from amazon so £1.40 worth in that cake. The most expensive bit is the 5 eggs! I know what you mean though, I have spent a small fortune on various substitute/alternative bags of stuff (vital wheat gluten, coconut flour, erythritol, etc etc) to investigate making low-carb things, and none of it is as cheap as wheat flour or white sugar.
I have a similar recipe, designed as keto. And I had a large box of organic oranges from crowdfarming so boiled and whizzed then froze some of them for this recipe.