Make a simple syrup by dissolving 1 cup of sugar in 1 cup of boiling water. Let cool and add 2 teaspoons of limoncello. Zest a lemon so the zest falls in one long strip to coil on the inside of the cocktail glass. Pour 1–2 tablespoons of simple lemon syrup in glass and top with chilled Champagne. Plisse tumbler, $37.50, by Cristallerie de Portieux, Tommy crystal shaker, $500, by Saint Louis Crystal, silver-plate serving tray, $195, from the Challis collection by Vera Wang, all from Michael C. Fina, michaelcfina.com.