It's actually pretty easy to make your own pumpkin puree at home, and the fresh puree can be used as a canned pumpkin substitute for any recipe calling for it. After cooking and draining ...
Alternatively, milder-tasting mackerel goes well with finely chopped olives and pine nuts, or with slices of buttery avocado and toasted pumpkin seeds. It's easy to turn tinned fish and canned ...