This gin fizz modification goes heavy on the berries. In addition, I added Linie aquavit for a different flavor. The hint of smoke and caraway worked well with the fruit and gin.
For the drink:
-1 1/2 oz amber gin (Inverroche Amber)
-1/2 oz aquavit (Linie)
-3/4 oz fresh lemon juice
-1/4 oz fresh lime juice
-1/3 oz simple syrup
Put the strawberries, blackberries, raspberries, and gin in a cocktail shaker. Muddle the berries for 5 to 10 seconds. Add the remainder of the ingredients, except the seltzer, ice, and shake for 10 seconds. Strain through a Hawthorne and fine mesh strainer into your glass.