Gather 1 liter of orange soda and 6 ounces of sweetened condensed milk. Prepare a large mixing bowl, a whisk or spoon, and either an ice cream maker or a freezer-safe baking pan.

Pour the orange soda into the large mixing bowl. Slowly add the sweetened condensed milk, stirring gently until combined. Avoid vigorous stirring to prevent excessive foaming.

Ice cream maker method: pour the soda and milk mixture into an ice cream maker and churn according to the manufacturer's instructions for about 20-30 minutes, until it reaches a soft-serve consistency. For a firmer texture, transfer to a freezer-safe container and freeze for an additional 2-4 hours.

No-churn method (no ice cream maker): pour the mixture into a shallow freezer-safe pan. Freeze for 1 hour, then stir to break up ice crystals. Repeat every 1–2 hours twice more, then continue freezing until firm, 6–8 hours total.

If too firm, let it sit at room temperature for a few minutes to soften. Scoop and serve.