Sweet potatoes Tang Yuan

Ingredients

• 150 g glutinous rice flour
• 80 g cooked purple sweet potatoes
• 1 tbsp sugar
• 1 tsp cooking oil
• 50 mL water
• 80 g cooked orange sweet potatoes
• 60 g custard powder
• 40 g milk powder
• 45 g sugar
• 100 mL coconut milk
• 80 mL milk
• 1 piece egg, beaten
• 25 mL cooking oil or melted butter
• 1000 mL water
• 2 pieces pandan leaves, knotted
• 10 g sliced ginger
• 50 g palm sugar