Write the next sentence in the following story.

How to cook austrian chocolate and walnut tart
Beware any hands!
Since tart dough must be cold, like the ingredients, keep your warm hands out of the mixture.
Mix the flour, sugar and cocoa powder.
Add butter, cut into cubes.

OPTIONS: + The cocoa powder helps to fluff up the dough rather than squash. There you have it! Next is the flour.. + Mix the ingredients until that you get a sandy texture composition. Do not mix a lot, just enough to heat the butter.. + Add 2 cups (500 ml) of water. Stir slowly, because boiling water can make the dough hard and rubbery.. + Thoroughly combine as much of the wet and brown sugar as possible and then add the chocolate. Cover with a greased parchment paper to keep the butter in if the butter melted... The answer should be
Mix the ingredients until that you get a sandy texture composition. Do not mix a lot, just enough to heat the butter.