In a saucepan, combine the sugar and the water and place it on medium heat. Cook the mixture while continuously stirring with a silicone spatula or wooden spoon until it starts boiling.
100 grams white granulated sugar, 38 ml water
Stop mixing and let the sugar cook until it turns a deep amber color, about 5-8 minutes. Keep swirling the pan every few minutes through the process and brush down the sides of the pan with a wet pastry brush to avoid crystallization.
As soon as the caramel turns amber, take it off the heat and mix in the mango chunks. Return it back to the heat and let it cook for 2-5 minutes, until the mangoes soften, stirring occasionally.
115 grams fresh mango chunks
Lower the heat to medium-low and gradually add the whipping cream while mixing. Be careful as the cream can splatter while pouring. Mix until combined, then add the butter and salt and mix until all the butter has melted.
60 ml heavy cream/liquid whipping cream, 28 grams unsalted butter, 1/4 th tsp kosher salt
Let the mixture cook for 5-10 minutes until it thickens, then take it off the heat. Once the caramel has cooled down, blend it with a standard or stick blender until you have a smooth caramel sauce. If the caramel is too thick, add a few teaspoons of extra cream while blending until it reaches the right consistency