Making Slow Cooker Beef Pho involves a few simple steps that guide you to delicious results:

1. Prep the Beef: Cut the beef chuck roast or brisket into large pieces and season lightly with salt.
2. Prepare Aromatics: Place the halved onion, smashed garlic, and sliced ginger into the slow cooker with the beef.
3. Add Spices: To the slow cooker, add the star anise pods, whole cloves, cinnamon stick, and coriander seeds.
4. Combine Ingredients: Pour in the beef broth, followed by the fish sauce and sugar. Stir to integrate all the ingredients.
5. Set the Slow Cooker: Cover the cooker and set it on low for 8 hours or high for 4 hours, allowing the flavors to develop beautifully.
6. Cook the Noodles: About 30 minutes before serving, cook the rice noodles according to package instructions. Drain and set aside.
7. Adjust Seasoning: Once cooking is complete, taste the broth. You may want to add more salt or fish sauce based on your preference.
8. Strain the Broth (Optional): For a clearer broth, strain out the solids using a fine sieve, then return the broth to the slow cooker.
9. Serve the Pho: In a bowl, add cooked rice noodles, ladle in the hot broth with beef, and top with fresh herbs and bean sprouts.