Also, if you want extra insane chocolate - y goodness, use black cocoa powder - it was all I had on hand, it made them taste extra delicious! (isachandra.com)
I also replaced 1/4 cup of the flour in the crust with an ultra black cocoa powder to make a chocolate crust. (kingarthurflour.com)
They sound amazing and that black colour is stunning.I'm only gutted that I can't get hold of black cocoa powder for the life of me in The Netherlands or even online to ship it here. (thebakingchocolatess.com)