Sinigang na tuna (tuna stew in tamarind)

Ingredients

• 1 kilo prime cut tuna
• 8 cups of rice washing,
• 2 medium onion, chopped,
• 4 pieces plum tomatoes, quartered,
• 5 pieces taro roots , peeled and sliced
• 1 teaspoon salt or to taste,
• 4 pieces whole green chili,
• 2 bunches bok choy, washed and halve
• 1 sachet sinigang mix in tamarind.