Authentic Pho

Preheat oven to 425 degrees F (220 degrees C).

Place beef bones on a baking sheet and roast in the preheated oven until browned, about 1 hour.

Place onion on a baking sheet and roast in the preheated oven until blackened and soft, about 45 minutes.

Place bones, onion, ginger, salt, star anise, and fish sauce in a large stockpot and cover with 4 quarts of water.

Bring to a boil and reduce heat to low.

Simmer on low for 6 to 10 hours.

Strain the broth into a saucepan and set aside.

Place rice noodles in large bowl filled with room temperature water and allow to soak for 1 hour.

Bring a large pot of water to a boil and after the noodles have soaked, place them in the boiling water for 1 minute.

Bring stock to a simmer.

Divide noodles among 4 serving bowls; top with sirloin, cilantro, and green onion.

Pour hot broth over the top.

Stir and let sit until the beef is partially cooked and no longer pink, 1 to 2 minutes.

Serve with bean sprouts, Thai basil, lime wedges, hoisin sauce, and chile-garlic sauce on the side.