In a medium saucepan, combine one cup of the water with brown sugar, peppercorns, and 4 cinnamon sticks over medium-high heat. Bring to a simmer, stirring occasionally, and then remove the syrup from heat. Cover and let sit for about an hour and a half, then strain. Once the syrup has cooled, combine the Averna, lemon juice, and 1/2 ounce of the syrup in a mug. Top with four ounces boiling water and garnish with a lemon peel. The syrup can be stored in the refrigerator in an airtight container for up to two weeks.