Heat up wok or non-stick pan on medium heat at add 1 tbsp of vegetable oil
Add Chinese sausage and cook for about 2-3 minutes until they are dark and almost burned (some burn marks ok). Remove the sausage to another plate when finished.
Do not drain wok, you can have the oil from the sausage to cook the scrambled eggs. Reduce the heat to low and stir in the eggs. Scramble the eggs, and remove to plate when finished.
Increase the heat to medium-high and add 2 tbsp of vegetable oil to the wok. Add day old rice, and mix around for a minute.
Add in the soy sauce, sesame oil, and white pepper, and mix for 1 minute.
Add Chinese sausage, celery and egg to the wok,
Cook and mix until you like the consistency of the rice. All the ingredients are pretty much cooked so I would just cook until you get the rice as fried as you like it.