Combine all ingredients except Angostura in a cocktail shaker without ice. Shake for 8-10 seconds. Add ice and shake again for 8-10 seconds. Strain cocktail into a rocks glass over a large ice cube. Allow foam to settle. With a dropper bottle, place several drops of Angostura bitters in a circle on top of the cocktail. Run a toothpick through the drops to create a design.

Homemade Ingredient

Lemon Oleo-Saccharum:
Zest of 6 Lemons, 6 oz of sugar, 10 oz of fresh squeezed lemon juice

Peel the citrus, trying to avoid the bitter white part, and place the peels into a clean bowl.
Add the sugar onto the peels and stir to coat them.
With your hands, massage the sugar into the peels, releasing the oils into the sugar 
Let the mixture sit covered for at least 6 hours or overnight. Add fresh lemon juice to mixture after oils from peels are released to create a more liquid solution and stir to combine. Strain off the liquid from peels into a bottle to store.