Bake the tarts in the oven for about 25 minutes - you may need to turn the temperature down to 180C/350F/Gas 4 for the final 10 minutes. You are looking for a very slight dome on the custard ...
And while tons of bakeries around the country make pastéis de nata, the original version is made using a 100-year-old secret recipe ... The second is their egg custard: more delicate, light ...