This rich, creamy flan takes a traditional recipe and gives it the coffee flavor Kahlua fans love. You'll need a dish about the size of a 9-inch pie pan or cake dish, and another larger dish to create a double boiler in the oven. I prefer to use glass, but you can use what you have on hand.
In a heavy sauce pan add white sugar, light brown sugar and water. Stir ingredients together and place over low-medium heat.
Continuously stir sugar as it heats up. It should turn into a golden-brown sauce. Once it reaches a syrup-like consistency, about 5-10 minutes, quickly pour caramel sauce into 9-inch pie pan. Swirl around pan so it coats the bottom of the pan and just up the sides. Sugar will harden fast. Set aside.
Add eggs and egg yolk to a small dish and beat together until just mixed. Do not over-beat.
In a large mixing bowl, stir together condensed milk, evaporated milk and vanilla extract. Add eggs and Kahlua and stir all ingredients together until well combined.
Pour custard over strainer into another mixing bowl. This is to remove any clumps that may have formed in the custard and will help make the flan more smooth and creamy.
Add custard to pie pan, pouring on top of the caramel sauce. Place whole pie pan into a bigger baking dish (a glass lasagna pan works well for this, but any bigger pan you can fill with water will do). Fill bigger pan with 1-2 inches of water, or about half way up the side of the pie pan.
Place flan in oven and cook for about 60 minutes, or until sides of flan look firm and center looks like it moves slightly when the pan is moved.
Remove from oven and let cool. Once cooled, place in refrigerator for at least 2 hours before serving. Can also be left in refrigerator overnight for the next day.
When ready to serve, use a knife to go around the sides of the flan, loosening it from the dish. Place a plate over the flan. Flip entire dish over quickly, the custard should release from the 9-inch pan and will now be on the plate. Pour leftover caramel sauce in top of flan.
Serve by itself or with strawberries, whipped cream or chocolate.