Step 1: soak beef tendon in blood for more than one day, and then marinate it with spices, cooking wine and seasonings for more than one day.

Step 2: Boil beef bones in a pot, simmer for 4 hours, and then add butter.

Step 3: Mix the soup well, then stir-fry the sugar color, add the fried sugar color, and then put the soaked meat in to cook. The core is secret spices, and the spices for making preserved beef are the most critical and exquisite.

Simmer 1.5 hours, simmer again 1 hour, simmer again for 30 minutes, and simmer again. The color of preserved beef is very gratifying, red. The key is to taste delicious.