Serai sayur lodeh (coconut vegetable stew)

Ingredients

• 2 pieces of white tofu - sliced
• 2 sweet potatoes - remove skin and cut into chunks
• 20 long beans - sliced to 1 inch length
• 1 lemongrass
• 5 garlic
• 4 shallots
• 1-2 red chilies -remove seeds and sliced thinly
• 2 sprigs coriander leaves - shredded
• 1 cup thick coconut milk
• 1 tbsp of oil
• Salt for taste