Broth Preparation: Begin by parboiling the beef bones. Place them in a large stockpot, cover them with water, and bring to a boil. After a few minutes, discard the water and rinse the bones to remove any impurities. This ensures a clear and clean broth.
Charring Aromatics: On an open flame or in a broiling oven, char the onion halves and ginger until they develop a slightly blackened exterior. This process imparts a smoky depth to the pho.
Spice Toasting: In a dry pan, lightly toast the spices - cloves, cinnamon stick, star anise, and cardamom - until they release their fragrant aromas. This step awakens the spices and enhances their flavour profile.
Simmering the Broth: Combine the cleaned beef bones, charred aromatics, toasted spices, and enough water to cover the stockpot. Let this mixture simmer gently for a minimum of 6 hours, occasionally skimming off any impurities you might find rising on the surface. The long-simmering process allows the ingredients to meld and create a rich and flavorful broth.
Noodle Preparation: Soak the noodles in warm water until they're pliable, then boil them briefly until they're soft but retain a slight bite. Drain and set aside.
Assembly: Place a portion of the cooked noodles in a bowl, followed by thinly sliced beef. In order to instantly cook the meat, ladle the broth over it. Finish with your chosen toppings, including fresh herbs, bean sprouts, lime wedges, and sliced chilli peppers.