In a blender, combine frozen peach slices, granulated sugar, cold water, and fresh lemon juice. Blend on high for 2-3 minutes until smooth.

Pour the peach mixture into a metal loaf pan or freezer-safe container, spread it evenly, and cover securely.

Freeze the container for at least 4 hours, preferably overnight, until the mixture is solid and firm.

Before serving, let the sorbet sit at room temperature for about 5 minutes to soften slightly.

Scoop the softened sorbet into chilled bowls or glasses, and serve immediately. Optionally garnish with fresh mint leaves.