Prepare all ingredients (mise en place)- make sure all chopping is done and ingredients are laid out.
Add sesame oil to the wok and get it smoking hot.
1/2 cup Sesame oil
Once the oil is smoking hot, add pork and chile pepper and cook 5-6 minutes, or until no longer pink, stirring constantly.
1 tsp chile pepper of your choice, 1 1/2 lb pork loin
Add garlic and stir for 30 seconds; then add oyster sauce and stir occasionally for a couple of minutes until it thickens a bit.
2 Tbsp minced garlic, 1 1/2 Tbsp oyster sauce
Add celery and stir in for about 1 minute; then add chard, fish sauce, vinegar and sherry and cook for about 2 minutes, or until chard leaves are wilted.
2 cups celery chopped, 1 small bunch chard, 3 Tbsp fish sauce, 2 tsp apple cider vinegar, 1/4 cup dry sherry