Pour the sugar and water into a pot and melt over medium/low heat. Shake the pan occasionally melting the sugar evenly. In about 20 minutes your sugar will become a thick, brown caramel, set it on the side and let it cool.
Quesillo
Set your oven to 350 degrees
Bring into a blender all the ingredients: eggs, condensed milk, milk, vanilla and rhum and blend until velvety smooth.
Pour your mix to the caramel pot and let it set
Grab a big baking dish and fill it with water. Grab your caramel pot and cover it with a lid, put it inside your baking dish filled with water and bake it for 1 hour and 15 minutes.
Using a knife, loose the edges of your quesillo and let it cool one hour without the lid and one hour in the fridge.
Grab a platter and to serve the quesillo just carefully flip it onto your serving dish allowing the caramel to drizzle over the top.