In part of the water, dissolve the starch and pour into the mass, stirring constantly. You can add a drop of narsharab to taste. Bring to a boil, stirring constantly. When boiling, a white starch film forms on the surface. Over low heat, bring it to the point that it gradually rises along the walls, as if it had collapsed in the center. Then our sauce will turn from cloudy to ruby-red and transparent. Mix it.