Preheat your oven to 325° F. Set the oven rack to the middle of the oven. Heat 4 cups hot water and keep ready for filling the baker after the filled ramkins are set in the baker and placed in the oven.
Heat the sugar over medium heat with 2 teaspoons of water (to help prevent scorching). Stir constantly until the sugar melts and turns brown. Pour 2½ to 3 tablespoons of the caramelized sugar in each of the 6 ramkins. Set the ramkins into the creme brulee rack, and set the rack inside the baker. Set aside.
¾ cup white sugar
Crack the eggs, collecting the egg yolks in a bowl and saving the egg whites for another recipe, another time.
12 egg yolks
Stir in the condensed milk, half and half (or whole milk), vanilla, and Ube extract. Stir to mix well with a wire whisk or a hand mixer.
14 oz can Condensed Milk, 1 cup half & half, 1 teaspoon vanilla, 1½ teaspoon Ube extract
Pour mixed flan mixture into each ramkin, dividing it equally. Cover each ramkin with a small piece of aluminum foil. Set each ramkin into the creme brulee rack or place in a 9 x 13" baking pan.
Place the creme brulee baker or 9 x 13 baking pan holding the ramkins in the middle of the oven. Pour hot water in the baker until it come to 1" from the rims of the ramkins. Gently slide rack into the oven and bake for 50 minutes.
Remove creme brulee baker carefully after baking. Lift the rack out of the hot water and set in the refrigerator for 1 to 2 hours until set up and cool.
Remove the aluminum foil covers. To serve, run a thin knife along the inside of each ramkin. Run hot water over the base of the ramkin for 30 seconds. Place a saucer over the top, then flip over. The flan will fall out upside down with the caramel sauce drizzling own the sides. Serve and enjoy!