[header] How to make pho [title] Collect beef bones. [step] Although your pho will get a lot of its flavour from the ingredients you throw into it while cooking, it's a good idea to rely on beef bones for the majority. A lot of beef flavour sinks into bone marrow, making bones a perfect tool for creating hearty broths. 
It's recommended you fill up a pot with water and put in the bones as early as you can. A broth needs at least 6 hours simmering to complete, and you'll want to replace the bones with meat ingredients at an earlier stage.