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We had roast veg soup last night ( Actually, moxed roast veg leftover from a roast and then blitzed till smooth but hey, close enough).
I'll definitely give your recipe a go. Roasting butternut gives it such a lovely smooth silky taste that you don't get from just boiling it.

That sound like a good idea to use up left over veg.

Glad to see your post is doing so well. <3