Chocolate rose porter

[gimpmeister]

I had a picture of a chocolate porter flavored with rose petals. Has anyone ever used rose petals in their homebrew? Curious how the flavor blends and how much is needed.
I've seen dandelion porter but not rose petals. Could be fun right?

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[Brewmex41]

Rogue's MoM Hefeweizen is brewed with rose pedals. I've never tasted it or brewed with them myself but there are commercial examples out there.