I used half & half as I did not have whole milk on hand. However, you can use whole milk and make sure to boil until it reduces to half the quantity. I also did not add any additional sugar but feel free to adjust the sweetness to your taste. Since fresh custard apple is not readily available in my area, I used frozen custard apple from Vadilal Treats brand found at Indian grocery stores. Basundi is usually served with puri (Indian puffed flat bread).