Heat the oven and boil water.
Set the oven to 350°F with the rack in the middle. Put a full kettle on. You need boiling water for the water bath. Prepare a roasting pan for the water bath. Line it with a kitchen towel.
Also get 10-inch round pan for the flan. Set aside.
1. Pan: A 10-inch (25 cm) round pan about 2 inches deep. It also works in one 13x4 Pullman loaf pan or in 9 ramekins - the pan chart in the post above, under “What pan to use for flan”, has the depth and bake time for each. Do not use a springform pan, the seam leaks both ways.
2. Halving: The recipe halves cleanly. Use 8 yolks, one 14 oz can of condensed milk, one 12 oz can of evaporated milk, and 1/2 tsp vanilla, in an 8-inch round pan. For the caramel, use 1/2 cup sugar and 2 Tbsp water. Start checking at 55 minutes.
3. Air bubbles: Whisk gently and strain. Air whipped into the custard bakes into holes.
4. Water bath: Pour the boiling water once the roasting pan is already on the oven rack, so you are not carrying it across the kitchen.
5. Leftover whites: Sixteen egg whites freeze well in a covered container for up to 3 months, or go straight into meringue.
6. Metric: Sugar 150 g, water 60 ml, condensed milk 794 g, evaporated milk 710 ml, vanilla 5 ml.
7. Doneness: A thermometer beats the clock on a pan this size. Pull it at 175°F to 180°F in the center. Ovens vary, so start checking at 85 minutes.
8. Firmer set: If you want a flan you can cut into clean slices, use 4 whole large eggs and 8 egg yolks in place of the 16 yolks. The whites set firmer, so it holds its shape instead of wobbling, and the custard bakes a shade paler. Nothing else changes.
9. Do not overcook - overcooking will curdle the flan and make it grainy instead of custardy smooth. Watch the video for what the wobble should look like when the flan is done, or use a thermometer.
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