In a bowl, combine dark brown sugar, light brown sugar and hot water. Mix well until sugar completely dissolves. Add oil and glutinous rice flour.
Sift in the flour. Gently stir, mix well.
Line the loaf pan with banana leaves Use rubber band to secure the sides. Pour mixture to the pan and steam it.
Ready the steamer by pouring about 4 cups of water. Turn on the fire, cover the steamer and let it boil for 3 to 5 minutes. Place the loaf pan with tikoy batter in the steamer.
Cover the loaf pan with banana leaf. Place the cover of the steamer and steam it for 40 minutes. After steaming, remove the tikoy from the steamer and let it cool.
Refrigerate at least 1 hour. When completely cool, remove tikoy from loaf pan and the banana leaf. Cook or store until ready to serve.