Step 1: Juice fresh limes until you have 1 cup of lime juice and fresh oranges until you have 1/2 cup of orange juice.

Step 2: In a mixing bowl or pitcher, combine the lime juice, orange juice, tequila, triple sec, simple syrup, and salt, then stir until well blended.

Step 3: Pour the mixture into a freezer-safe Creami container and add ice cubes up to the fill line.

Step 4: Freeze the mixture for at least 6 hours or overnight to ensure it is fully solid.

Step 5: Remove the container from the freezer and let it sit at room temperature for 2 to 3 minutes to soften the edges.

Step 6: Place the frozen container into the Ninja Creami machine and secure it according to the manufacturer’s instructions.

Step 7: Select the 'Sorbet' or 'Slushi' texture setting and run the machine for 3 to 5 minutes until it becomes a smooth frozen slushy.

Step 8: Pour the finished margarita into salt-rimmed glasses, garnish with lime wheels, and serve immediately.