Baño de María . . .
Place the casserole with the flan into a larger rectangular pan that is at least 2 inches deep.
Place both of these into an oven that's been preheated to 350ºF
Now pour hot water into the larger pan to about ½" from the top of the casserole.
You can boil the water in a tea kettle or something else than has a "spout" for easy pouring."
Pouring the water directly into the pan in the oven lessens the chance of any spilling and
also of water getting into the flan pan.
Bake for approximately as per recipe instructions, until a knife comes out clean
when inserted into the center of the flan.
Let cool and refrigerate. When ready to serve, carefully invert the flan onto
a serving plate. The caramel syrup will cover the flan.
Store refrigerated. May be served at room temperature.