Wash the cranberry well and pat dry. Put it in a ziploc bag and muddle very lightly in order to break the berry slightly but keep the shape intact as far as possible. (Do not use food processor as it will mash the berries completely ) Keep it ready.
Heat a pan with one cup water and cinnamon sticks. Bring it to a rolling boil then add sugar reduce heat . Do not stir instead simply swirl the pan by holding the handle.
When all the sugar melts switch of the stove and allow it to come to room temperature then add the lightly bruised cranberry.
Pour this into a large glass bottle and top it off with vodka till the brim of the bottle. Keep it in a dark place and after 2-3 days max 7 days. It is ready to use now. Mix in the rest of the vodka if the entire bottle did not fit into the infusing bottle before bottling.
It is ready to be bottled. Pour into gifting bottles and insert a sprig or two of rosemary into the infused vodka bottles.Sits well in room temperature up to a month.
Bonus - The vodka soaked cranberry is very flavorful so do not throw away the berry. Instead it can be served in the cocktails as garnish.
To serve : Pour cranberry vodka over ice and add tonic water to taste. Garnish with rosemary sprigs or a slice of orange, lemon , lime etc
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Notes
Cranberry infused vodka is good just by itself with tonic water or it can be used to make other alcoholic drinks like martinis, cosmopolitan etc