How to Make It
Juice the red tomatoes in an electric juicer (you should have 4 cups of juice). In a medium saucepan, combine the tomato juice with the rice vinegar, sugar and kosher salt and bring just to a boil. Remove from the heat and add the bonito flakes and kombu. Let steep for 20 minutes, then discard the kombu. Transfer the mixture to a blender and puree until very smooth, then strain through cheesecloth into a medium bowl. Refrigerate the sorbet base until it is well chilled, about 2 hours.
Transfer the chilled sorbet base to an ice cream maker and freeze according to the manufacturer’s directions.
Meanwhile, arrange the green tomato wedges in 4 shallow bowls and season with sea salt and pepper. Garnish with cilantro and mint. Add 2 small scoops of the sorbet to each bowl and serve right away.