caramelize 1/2 cup sugar in small skillet. Pour into baking dish (w/ cover) to coat bottom.
Beat eggs lightly. Slowly add 1 cup sugar until dissolved. Add the three milks and vanilla. Beat 2 minutes, slowly. Pour custard into prepared baking dish. Set in hot water bath (water about half way up sides of baking dish). Put on lowest rack of oven. Set oven to 350 degrees. Bake 1 hour + 20 minutes. Cool 1 hr. Carefully invert pan onto serving dish with sides. (Caramel is hot liquid and will coat flan). Hint: I cool flan in baking dish and put in fridge for 24 hrs. Then I invert onto lovely serving dish and serve. Seems to be more delectable when cold.