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Would spinach and lentils be a decent substitute?
Which recipe are you following? If you're preparing duxelles, I don't think a lot of harm [apart from wrecking the flavour] would come from leaving out the dried mushrooms and not adding anything in as a substitute.
I don't think I'd be averse to sweet red peppers instead of fresh mushrooms if you think the water content needs to balance.
Would spinach and lentils be a decent substitute? I've never cooked with mushrooms.
My tenderloin is looking at me longingly