Split vanilla beans and add seed and bean to a saucepan.
Add cinnamon sticks to a saucepan and muddle them to crack them open.
Add sugar and water and bring to a slight boil.
Let boil approximately 5 minutes then remove from heat and cover.
Let sit for at least 5 hours, up to overnight.
Strain through a fine-mesh sieve into an airtight container.
Use in cocktail and beverage recipes.
Notes
Store in an air-tight jar or bottle in the fridge for up to 2 weeks. To make this less sweet, you can use less sugar. I like to do 1 cup of sugar to 2 cups of water.