Add frozen mango chunks to the blender.
Pour in the lime juice and sprinkle the ground cardamom over the mango.
Secure the lid on the blender and blend on high until the mixture is smooth, thick, and icy, about 30-45 seconds. The sound should be loud and consistent, and the mixture should look velvety with no chunks remaining.
Pour the blended mango slushie into glasses, swirling slightly as you do to showcase its vibrant color.
Optionally, garnish with a small lime wedge or a sprinkle of extra cardamom for visual appeal.
Serve immediately with a straw, enjoying the icy, fragrant, and colorful beverage.