Beef hotpot dipped in vinegar

Ingredients

• 500 gram Beef
• 400 gram Coconut water
• 1 tree Lemon grass
• 2 fruit Chili
• 200 ml Rice vinegar
• 0.5 fruit Pineapple
• 1 tuber Onion
• 1 tuber Garlic
• 1 spoon Mắm nêm