Squeeze the orange juice and set aside until you have two cups.: When you squeeze fresh orange juice you will notice the bright citrus scent immediately, a fragrant burst that tells you the juice is fresh and lively. The sound of the juicer or the rhythm of hand squeezing gives a little ritual quality to the prep. Strain out any seeds and let the juice rest briefly so pulp settles, making it easier to measure two cups accurately. If you skip fresh juice and use prepackaged juice, the aroma and brightness will be noticeably diminished, so freshly squeezing is worth the small extra effort. A common mistake is squeezing impatiently and leaving membranes or seeds in the juice which add bitterness and gritty texture, so strain carefully.
Place the cut up papaya, banana and fresh orange juice into the blender and blend until smooth.: As you start blending, you will first hear a soft whirl that grows into a steady, powerful hum, and the mixture will turn from chunky to a silky, uniform color. The smell becomes more pronounced as the papaya and orange marry, releasing tropical perfume. Aim for a smooth, creamy consistency without large fibrous bits; this signals the right texture. Blending too briefly leaves stringy papaya fibers, and over blending, especially with warm fruit, can make the mixture too thin, so pulse and check. One common error is adding everything at once; instead add liquids first, then solids, to help the blender process evenly and avoid air pockets or uneven pureeing.
If you wish you can squeeze some fresh lime juice.: A small squeeze of lime will introduce a sharp, citrusy counterpoint that brightens the sweetness, and you will notice a zippy aroma immediately. Taste before adding, then add tiny increments, because lime is powerful and can dominate the delicate papaya notes. Stir and taste after each squirt to find balance. Many people overdo it and end up with a drink that tastes mostly of lime, so add conservatively and with restraint. Avoid bottled lime which often tastes flat or overly acidic compared to fresh, and watch for bitterness from the white pith if you squeeze too hard.
Serve over ice or keep chilled in the refrigerator.: Serving over crushed ice gives a refreshing, slushy mouthfeel and mutes any overly strong sweetness, while chilling preserves the textures and aromas if you are not serving immediately. The sound of ice clinking against glass is part of the experience and signals a perfectly cool drink. If you plan to store it, pour into an airtight container and chill, but expect some separation; a quick stir or short reblend will bring it back. A common mistake is leaving the shake unrefrigerated for too long, which will dull its freshness and can slightly ferment if left in warm conditions, so keep it cool and consume within a day for best flavor.