I made a batch of custard cups at home and they came out beautiful. When I followed the recipe at work, using the same method and a still oven like at home, the results were a disaster. The custard had the texture of scrambled eggs. Any ideas on what went wrong?
I've had this exact same issue when making Creme Brulee. If you heat the mixture too long it will turn to the consistency of scrambled eggs. I have figured out that if I gently jiggle the pan a few minutes before it is supposed to be set and you will see a slight wobble. Repeat this for the next few minutes until it wobbles less, then remove it immediately
This is the method that works best for me. There are so many variations due to the oven, altitude, number of eggs in your mixture, etc. to give you an exact time. It took me at least 15 tries to finally get my creme brulee recipe right but now I know what to look for when its done.
When you heat egg yolk without proper tempering you'll end up cooking the egg into a solid. If you're baking custard, which is sounds as though you are, you should cook in a hot water bath to avoid direct heat. If you did use a water bath and did temper your yolks then perhaps lower the custard on the baking rack to avoid too much direct heat, as you want to cook it primarily with ambient heat.