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Return the mixture to the saucepan and cook on low heat. Keep stirring to gradually thicken the custard while preventing it from boiling, which could ruin its consistency. Achieving that perfect thick custard base generally takes about four to five minutes.
If, at any point, the custard curdles despite your best efforts, don't panic! An immersion blender can rescue your mixture, restoring it to its silky smoothness. After reaching the desired texture, strain the custard through a fine sieve to ensure an impeccably smooth end product.