Line a square pan with parchment paper, set aside
Melt margarine in a pot over medium heat
Stir in sugar, syrup and salt
Stir in condensed milk
Cook until candy thermometer shows 120 C or 248 F
Take off from heat, let bubbles gone then stir in vanilla extract
Pour hot caramel into prepared pan and let cool to room temperature
Chill in the fridge for several hours/overnight