First of all, you have to toast the sesame seeds. Do it on an ungreased skillet, and on high heat, but with constant stirring. Itll take about four to five minutes to get them golden brown, and once theyre done, transfer them into a bowl or a plate. Next, using the same skillet (no need to wash), cook sugar, vanilla, and three tbsp of water over medium heat. Keep stirring until all of the sugar has melted (about ten minutes), then add the sesame seeds while stirring.