tuna in vinegar (paksiw na tuna)

Ingredients:

1 kilo of tuna (cleaned and cut into pieces)
1 cup of vinegar
1/4 cup of water
5-6 cloves of garlic (minced)
1 large onion (chopped)
1 thumb ginger (crushed)
1 tsp of peppercorn
salt to taste
1 Tbsp fish sauce (optional)

Procedure:

Put tuna in a pot.
Pour the vinegar.
Add garlic, onion, peppercorn, ginger, salt and fish sauce.
Cook for 15-20 minutes in a slow to medium heat stove.
Serve with rice and vegetables.
Optional, serve with soya sauce with squeezed lemon.