- 4 1/2 pounds Granny Smith apples
- 1 (500-mg) tablet vitamin C, crushed
- 1/4 cup fresh lemon juice
- 1 (2 inch) piece peeled fresh ginger
- 1/2 cup sugar
- 1 tablespoon finely chopped fresh basil
- Slice apples and process enough slices in juicer, skimming and discarding any foam, to measure 3 1/2 cups juice, then transfer juice to a large bowl and stir in vitamin C and lemon juice. Process ginger in juicer, then stir 1 tablespoon ginger juice into apple juice.
- Pulse together sugar and basil in a blender until sugar is bright green and basil is finely ground, then stir into apple juice until sugar is dissolved. Let stand 5 minutes, then pour through a fine-mesh sieve into an 8- to 9-inch metal baking pan.
- Freeze, stirring and crushing lumps with a fork every hour, until evenly frozen, 3 to 4 hours. Scrape with a fork to lighten texture, crushing any lumps.