1. Slice the kiwis in half crosswise. Scoop the flesh from each half into a blender.
2. Add the mint leaves, lime juice, rum, and honey or agave. Blend until well combined. (There will be visible kiwi seeds, and that’s okay!) Taste, and feel free to add a little more honey or agave if necessary.
3. Divide the kiwi mixture amongst four glasses filled with ice. Top each cocktail with club soda. (I recommend 2-3 ounces per cocktail.) Garnish with a kiwi or lime round if you like.
For a non-alcoholic cocktail, try replacing the rum with non-alcoholic ginger beer for a spicy kick, or coconut water for a more tropical vibe.