1 Scrape the vanilla beans into the sugar and rub them in with your fingers. 2  Add the vanilla pod to the pan. 3  Stir in 1/2 cup of the mango puree until all the sugar is moistened. 4  Bring mixture to a rolling boil, cover and remove from heat. Stir in 1/2 cup of the mango puree until all the sugar is moistened. 2  Bring mixture to a rolling boil, cover and remove from heat. 3  Transfer it to a measuring cup, stir in the remaining 2 tbsp of the mango puree and let cool completely.