Place lemon juice, water and honey in a medium saucepan. Sprinkle gelatin over top and let sit for about 5 minutes. Turn the heat on medium-low and stir until gelatin is dissolved and the liquid begins to steam. Pour into an 8 x 8 – inch dish and refrigerate until firm, about 5 hours.
Spoon the jello into the bowl of a standing mixer, and with the whisk attachment, whip for 20 minutes (Yep, 20 minutes. That’s not a typo!), until light-colored and fluffy (it will look a bit like whipped egg whites). Pour mixture into an 11 x 7 -inch baking dish, cover with plastic wrap and freeze for 3 hours. Cut into cubes and serve alone or with berries and mint.