Bitter gourd & potato curry

Ingredients

• 3-4 medium size Indian bitter gourd - remove seeds and sliced
• 2 medium size potatoes - cut into medium size pieces
• 2 tomatoes - sliced thinly
• 1 red onion - sliced thinly
• 5 garlic - sliced thinly
• 1 tsp black mustard seeds
• 1 tsp fenugreek/halba seeds
• 3-4 sprigs curry leaves
• 1/2 cup thick coconut milk
• 2-3 tbsp curry powder - mix with water for a thick paste
• 1-2 tbsp tamarind juice
• 1/2 liter water
• 4 tbsp oil
• Salt for taste