In a large blender or processor, combine the lemon juice, zest, castor sugar and water
Blend until sugar is dissolved, then add the ice cream and blend well
Taste, and adjust sugar as desired
Serve immediately
Notes
Although this recipe has not been lab tested, a single serving should be low-FODMAP based on the ingredients (using available FODMAP data at time of posting)
You will use about 1 lemon for this recipe
Castor sugar is a very fine sugar, it will dissolve more easily than granulated sugar. You may substitute granulated sugar, but it may not incorporate as well
I like lactose-free Breyer’s Vanilla for this recipe