Combine the bell pepper juice, vodka, lemon juice, Basil Syrup, and ice in a cocktail shaker and shake for 10 seconds.
Strain the contents of the shaker into an ice-filled rocks glass.
Top off with the seltzer, garnish with a bell pepper slice, and serve.
Combine all of the ingredients in a medium pot over medium-high heat and bring to a boil. Reduce the heat to low and simmer, stirring constantly, until the honey has completely dissolved. Remove from the heat and set aside to allow the syrup to steep for 1 hour.
Once the syrup has cooled, strain out and discard the basil leaves. Transfer the syrup to the mason jar, ensure the seal is airtight, and store in the refrigerator.
Basil Syrup will keep in the refrigerator sealed in an airtight mason jar for 1 to 2 months.