Less than 10 ingredients and less than 30 minutes to prepare. Custard will need to set in the fridge for ~5 hours. Best to make the night before.
For betel leaf extract: finely chop 2 betel leaves and soak in 1/4 cup water for 10 minutes.
Mix cream, milk, sugar, rose water, rose syrup and betel leaf mixture in a small saucepan. Stir to combine all ingredients. Heat over medium heat, stirring until sugar dissolves, about 3 to 5 minutes.