[header] How to cook austrian chocolate and walnut tart [title] Beware any hands! [step] Since tart dough must be cold, like the ingredients, keep your warm hands out of the mixture. [title] Mix the flour, sugar and cocoa powder. [step] Add butter, cut into cubes. 
[title] Mix the ingredients until that you get a sandy texture composition. [step] Do not mix a lot, just enough to heat the butter.