What's a good vegan substitute for sour cream? There's a recipe I grew up with, that I would like to try to make a vegan version of.
Basically, it's mushrooms sauteed with onion and paprika, and then sour cream. 

Since my kitchen is now vegan, I'm wondering what would work as a substitute for the sour cream. 

I'm happy for ideas to be composite, and include something for flavour and something else for texture.
You can thin vegan mayo with lemon juice -- it gives you the blend of creamy and sour that you expect from sour cream.

I don't know how it behaves if you heat it too much, but it works well for sauces that are added at the end.