I've not had carrot and swede in a long time but I also like butter on that.
What kind of frozen veg is available there Marie? Maybe there is some in the frozen aisles.
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Sadly, the frozen aisles are pretty limited too, peas, spinach and mixed veg for the most part. I have been able to get fresh butternut squash though, which is also really nice - and not a bad substitute for potatoes
Try roasting a sweet potato! They taste amazing and are a great complex carb
Mashed cauliflower can be a tasty substitute for mashed potatoes. Give it a try