1. Preheat oven to 375 F.
2. Place 3 tablespoons of sugar in each of the three llaneras.
3. Set llanera on the stove over low heat and using tongs, move repeatedly over flames until sugar is melted and turns into a golden liquid.
4. Continuously tilt and swirl the llanera to ensure even melting and to distribute the liquid on the bottom of the mold.
5. Remove from heat and allow caramel to cool and harden. Repeat the process with the remaining llanera.
6. In a bowl, combine egg yolks and condensed milk. Stir to combine.
7. Add evaporated milk, gently stirring in a circular motion until blended.
8. Using a cheesecloth or fine-mesh sieve, strain egg-milk mixture to remove stray egg whites.
9. Pour mixture into prepared llaneras and cover tightly with foil Arrange in a a wide, oven-safe dish with about 1-inch of water (bain marie or water bath)..
10. Bake in the oven for about 50 minutes to 1 hour or until a toothpick inserted in the middle of custard comes out clean.
11. Remove from oven, allow to cool, and refrigerate to chill and completely set.
12. To serve, turn flan over on a serving plate, ending with caramel on top.