- Line a 25cm baking pan with parchment paper. Start by sprinkling all the peanuts and half of the sesame seeds all over the base of the pan.
- In a small saucepan, heat sugar, vinegar, and water over low heat and stir until sugar dissolves. Then bring to boil and cover the saucepan, allowing it to continue boiling until the sugar turns light amber in colour. This should take about 12-15 mins. Then, remove from heat.
- Carefully pour melted sugar over peanuts and sesame seeds, and sprinkle the remaining sesame seeds evenly on the top.
- Set aside to cool for about 5 mins, then use a sharp knife to cut the Fah Sung Thong before it cools and hardens completely.