When I make truffles, I use a multi step process to make them look pretty. First, roll the mixture into "balls". Let sit a little while at room temperature, roll in your choice of cocoa powder or cocoa powder mixed with powdered sugar (this is what I use) then roll again until smooth. Roll again in cocoa powder and refrigerate. Truffles taste better at room temperature
I only gave this three stars because it is not worthy of a special occasion. It tasted excellent and very chocolaty. The only major problem I had was scooping them out into balls. They were very lumpy and not attractive. They looked a little better after they were rolled in cocoa powder. I think the taste would be even better if they were rolled in powder sugar of a mixture of sugar and cocoa powder.