01 - In a small saucepan, combine honey, lemon juice, water, raspberries (or strawberries), and sugar (if using). Gently mash the berries and heat over low heat for 2–3 minutes, stirring until the honey dissolves and the mixture turns a vibrant pink.
02 - Pour the syrup through a fine-mesh sieve into a bowl or jug, pressing firmly on the fruit to extract maximum color and flavor. Discard the solids.
03 - Fill four glasses with ice cubes. Divide the pink honey-lemon syrup equally among the glasses.
04 - Top each glass with chilled sparkling water or club soda. Stir gently to combine without losing the carbonation.
05 - Garnish each glass with a lemon slice and fresh mint leaves. Serve immediately while chilled and effervescent.