Sup Panas dan Asam

Bahan-bahan (4 porsi)

• 2 tablespoons kanji dr tepung jagung
• 3 tablespoons air
• 1 kaleng kaldu ayam atau kaldu sayuran (14,5 ons/1 cangkir/240 ml)
• 1 1/2 cups air
• 8 oz (230g) soft tofu (cut into strips)
• 6 oz (230g) jamur kancing putih (batang dipotong dan tutupnya dipotong empat)
• 3 tablespoons kecap
• 2 1/2 tablespoons Chinese vinegar (apple cider vinegar or rice wine vinegar)
• 1 teaspoon kecap hitam (untuk pewarna)
• 3 dashes ground white pepper (or black pepper)
• 1 egg (beaten)
• 1 teaspoon chili oil (optional)
• 1 tablespoon chopped scallion (optional)