In a medium saucepan, combine coconut water and sugar. Cook over medium-high heat, stirring often, just until sugar dissolves. Remove from heat and whisk in coconut milk. Pour into a heatproof bowl, cover, and refrigerate until cold, 1 to 2 hours.
Freeze and churn coconut mixture in an ice cream maker according to manufacturer’s instructions.
While coconut mixture is churning, prepare mango mixture. In the container of a blender, pulse frozen mango, agave syrup, and lemon juice until thick and smooth, scraping down sides of blender as needed.
Layer coconut mixture and mango mixture in a freezer-safe, airtight container, as desired. Using a knife or wooden skewer, swirl the flavors together as desired. Cover and freeze until firm, at least 2 hours. Serve with waffle cones, if desired. Freeze in an airtight container for up to 1 month.
Recipe by Victoria at https://victoriamag.com/coconut-mango-swirl-sorbet/