1 ½ cups sugar
¼ cup water
3 cups milk
Grated zest of 2 oranges
5 large eggs
Pinch kosher salt
½ teaspoon vanilla extract
Combine ¾ cup of the sugar and the water in a small, heavy saucepan. Bring to a boil, brush down the sides of the pan with water, and boil for 6 to 7 minutes, or until caramelized. The sugar will be fragrant and a deep amber color when it is caramelized. Working quickly, divide the hot caramel among 10 ramekins, swirling each ramekin so that the caramel coats the bottom and half way up the sides.
Preheat the oven to 325˚F Combine the milk and orange zest in a small saucepan and heat to a simmer. Whisk together the eggs, salt, and remaining ¾ cup of sugar in a medium bowl. Continue whisking while adding the hot milk in a thin stream. Strain through a fine mesh sieve. Stir in the vanilla and skim off any foam from the surface. Divide the mixture among the ramekins and place them into a roasting pan. Add enough hot water to the roasting pan to come half way up the sides of the ramekins and bake for 38 to 42 minutes, or until just set. Remove from the water bath and let cool to room temperature. Refrigerate for 3 to 4 hours, or until firm.
To unmold, run the tip of a paring knife around the inside of each ramekin and invert onto a dessert plate.
Serves 10. Good any time of year, but especially in the winter when citrus is in season. You can tell that the flans are done when they jiggle like gelatin. Flans may be baked a day or two in advance and kept covered with plastic wrap in the refrigerator. Unmold just before serving.