No roasted pumpkin? No problem!
If you haven’t got any roasted pumpkin you can easily sub this with any other kind of root vegetable. I personally prefer the taste of roasted vegetables, but because you will be adding it into the fishcake mix, it won’t make much difference. Just steam or boil some pumpkin (or other root vegetable), mash it, and add to the fishcakes.
You could also add canned pumpkin if you have some, but this might have an impact on the nutritional information, so you should remember to adjust the quantity.