cup unsweetened cocoa powder
Pinch of salt
Combine the water and cocoa powder in a medium saucepan. Heat over medium while stirring to dissolve the cocoa. Stir in the sugar until dissolved. Bring to a boil and heat for 3 minutes, watching carefully to avoid boiling over. (Turn down the heat, if necessary.) Remove from the heat and mix in the salt and vanilla. Let set to cool. Use a funnel to pour into a clean glass jar with a tight fitting lid. Store in the refrigerator for up to two months.