In a medium saucepan, heat the oil until a light haze appears. Add the garic and fry for 30 seconds. Add the soup stock, bring to a boil over high heat.
add the pork balls and cook for approximately 1 minute. Add the noodles and stir thoroughly. Add the fish sauce, soy sauce, sugar, mushrooms and the white pepper. By this time the meat should be cooked through.
Remove from the heat and pour into a bowl. Garnish with the spring onion and season to taste.