Preheat oven to 300 degrees F.
In a small saucepan, boil 1¼ cup sugar and water, washing down sides until sugar melts and turns golden brown or a dark honey color. Remove from heat and pour into a 9-inch flan mold, tilting to cover bottom with caramelized sugar. In a stainless steel bowl, beat eggs, yolks, remaining sugar, vanilla extract, salt, cinnamon and nutmeg. In a saucepan over medium heat, heat milk, half-and-half and orange zest until steaming. Add to egg mixture, stirring constantly. Strain through a sieve into flan mold. Place flan mold in a baking pan. Pour warm water about halfway up side of mold.
Bake 40–45 minutes or until cooked, but still wobbly. Allow to cool.
Unmold
To unmold flan, run a paring knife around edge of flan to loosen it. Place a platter on top and flip mold over onto platter.
This recipe will also fill 12–14 (4-ounce) ramekins. Pour a small amount of caramelized sugar to coat each ramekin