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That is exactly what the first step is for: sugar, yeast and a bit of lukewarm milk sit together for 10 minutes and should build a visible foam. If nothing happens after 10 minutes, the yeast is dead or the milk was too hot, so start that step over with fresh yeast. Lukewarm means comfortable to the touch - hot milk kills the yeast before it can work.

Yes, chopped chocolate works, but cut it into small pieces so it does not tear the dough when you roll the triangles up. Keep the amount around the 80 g the recipe calls for, since more filling makes the slits harder to close and the chocolate leaks out. Whatever you use, fold it in on medium speed only until it is evenly spread, as the recipe warns against overmixing and melting it into the dough.

Cool them fully under the clean towel the recipe calls for, then keep them in an airtight container at room temperature. The towel traps just enough steam to keep the crumb soft instead of drying out. Dust with powdered sugar only right before serving, otherwise it dissolves into the surface and disappears.

Yes - after kneading in the butter and the chips, you can let the dough do its rise slowly in the fridge overnight instead of 60 minutes in a warm spot. Bring it back to room temperature before shaping, because cold dough is stiff and cracks when you roll the triangles. Then continue as written with the 20 to 30 minute rest on the tray before brushing and baking.

Usually the roll was too loose or the wide end was not the starting point - roll up from the wide end toward the tip and lay them seam side down on the tray. Also make sure you leave the wide end uncut when you make the 6 slits, since cutting all the way through removes the part that holds the crescent together. Skipping the 20 to 30 minute rest before baking also makes them spring open unevenly.