Chinese oxtail stew with star anise

Ingredients

• 3 pounds oxtail and vealtail
  
• 12 ounces dark beer
  
• ¹/₄ cup soy sauce
  
• ¹/₄ teaspoon salt
  
• 1 piece cinnamon stick
  
• 5 pieces star anise
  
• 1 teaspoon red pepper flakes
  
• 1 onion, diced
  
• 5 garlic cloves, sliced
  
• 6 coins of ginger