Creating your homemade rainbow sherbet involves one important process: layering flavors. Here are the step-by-step instructions:

1. Prepare Fruit Purees: Start by washing and chopping the fruits. For strawberries and blueberries, puree them in a blender until smooth, adding a little sugar if desired. For oranges, juice and pulp them, ensuring no seeds remain.

2. Make Sherbet Base: In a medium bowl, whisk together the milk, heavy cream, granulated sugar, lemon juice, vanilla extract, and a pinch of salt until well combined and the sugar is dissolved.

3. Mix Strawberry Layer: Divide the sherbet base into three bowls. Mix the strawberry puree into one bowl until fully incorporated. This will be your red layer.

4. Mix Orange Layer: In the second bowl, add the orange juice mixture, ensuring it’s blended well. This will be your orange layer.

5. Mix Blueberry Layer: Finally, combine the blueberry puree with the last bowl of the sherbet base. This will form your blue layer.

6. Layering: In an appropriate container, pour in the strawberry mixture first, spreading it out evenly. Follow with the orange layer, then the blueberry layer on top. Smooth the surface as needed.

7. Freeze: Cover the container, ensuring it’s airtight to prevent ice crystals from forming. Freeze the sherbet for 2-4 hours or until it is firm.

8. Scoop and Serve: Once ready, remove from the freezer and allow it to sit at room temperature for about 5-10 minutes for easier scooping.

These steps will guide you in creating the ultimate rainbow sherbet that will amaze everyone who gets to share in this treat!