In a large rondeau pot, toast beans and rice until lightly browned.
Add vodka, orange blossom water, vanilla beans and 8 cups water and bring to a boil.
Remove from heat, strain liquid and reserve liquid.
Put resulting mash back in pot, add 8 cups sugar and 8 cups water.
Bring to a boil, remove from heat, strain and reserve liquid.
Combine mash and both reserved liquids.
Keeps in refrigerator for up to one month.