Nibblous | hot and sour soup

Ingredients

• 6 cups (1.5 L) fresh chicken stock or stock cube variety
• 1/2 cup (125 ml) thinly sliced pak choy
• 1 cup (250 ml) thinly sliced shiitake, cloud ear, or other mushrooms
• 3 spring onions, green and white parts, thinly sliced
• 2 tablespoons soy sauce, or to taste
• 2 tablespoons finely chopped ginger root
• 2 tablespoons cornflour
• 2 tablespoons water
• 175 - 200 g firm tofu, cut into thin strips
• 3/4 cup (180 ml) rice vinegar, or to taste
• 2 teaspoons freshly ground black pepper, or to taste
• 2 eggs, lightly beaten
• 1 teaspoon toasted sesame oil