What tastes like marigold?

I'm looking to make Georgian Satsivi (example recipe), which has a complex unique flavour that is hard to describe. The recipe asks for marigold as an ingredient, which I can't find in my area.

I've got no idea what marigold tastes like, but I've got a feeling it's quite important to Satsivi's unique flavour, so I'd prefer to substitute it than just skip it.

I'm looking for a substitute that matches the flavour and I don't mind if the appearance is different. The only relevant discussion I can find speculates that marigold might be used in Georgian cooking for colour as a cheap saffron substitute and suggests tumeric, but that doesn't seem like a great match to satsivi in terms of flavour, and I'm not sure I believe the source.

So, is there anything that tastes similar to marigold?

(and what does marigold taste like, anyway?)