Let the frozen mango chunks sit on the counter for 5 minutes. This small rest helps the food processor grip the fruit without straining.
Add the cottage cheese, honey, lime juice, cardamom and salt to a large food processor. Process for about 1 minute until completely smooth and creamy.
Add the frozen mango and process for 2 to 3 minutes, stopping to scrape down the sides a few times, until it turns into thick, creamy soft serve with no icy bits.The frozen fruit does the freezing for you, while the cottage cheese adds the rich tang of a real mango lassi and a big protein boost.
Taste and add another teaspoon of honey if your mango is on the tart side, then pulse briefly to combine.
Serve right away as soft serve, or spread it into a loaf pan, cover and freeze for 1 to 2 hours for firm, scoopable ice cream.
Sprinkle with chopped pistachios before serving. If frozen longer than 4 hours, let it sit at room temperature for 15 to 20 minutes to soften.