To make the drizzle, stir together the cashew butter, spirulina, and water. The mixture should be thick and blueish-green in color. Scoop the mixture into a frosting bag or plastic bag for piping into the glass later, and set the bag aside in the freezer while you make the smoothie.: Close your eyes for a moment and notice the texture as the spoon drags through the bowl, the cashew butter giving a slow, glossy ribbon while the spirulina tints it a deep blue green. This thick paste should feel dense but still yield when pushed, which lets it pipe neatly. The reason this matters is that a thinner glaze will run and not create the pretty streaks you want on the glass, while too thick a paste will be hard to squeeze through a tiny bag tip. A common pitfall here is adding too much water at first, which can make the mixture drip instead of cling, so add liquid incrementally until you reach that ideal spreadable tackiness.
To make the smoothie, combine the water, orange juice, mango, banana, and pitaya puree in a high-speed blender and blend until thick and smooth. (If you don't have a high-speed blender, you might need to add more water to help it blend.): You will sense the weight of the bag grow as you fill it, the paste settling toward the tip, which is the right sign that you filled enough to decorate multiple glasses. Chill it briefly in the freezer to firm up the consistency, and you will hear the slight stiffening as it cools, making piping smoother. This step matters because a colder drizzle holds shape better against the cool smoothie. Avoid piping immediately if the paste is still warm from handling, because it will be looser and may not stay where you place it.
To assemble the smoothie, cut the tip off of the plastic piping bag filled with the blue-green drizzle and pipe it around the sides of a glass. Pour the smoothie into the decorated glass, then top with whipped cream, if desired. Crush the freeze-dried strawberries and blueberries between your fingers to create 'sprinkles' on top of the whipped cream, then serve!: The freezer will cool the drizzle quickly, and as it chills you may notice a faint sheen forming on the surface, indicating it's firmed. This helps maintain crisp lines when piping. If you skip this chilling period the drizzle can smear into the smoothie during assembly, so resist the urge to skip it for speed.
To make the smoothie combine the water orange juice mango banana and pitaya puree in a high speed blender and blend until thick and smooth: When the blender starts you will hear the fruits chop into paper thin shreds and then suddenly collapse into a velvety whirl, releasing sweet, tropical scents. Stop and scrape down the sides if any pockets of unblended fruit cling there, because even blending creates layers of texture that affect the final creaminess. I emphasize a high speed blender because it gives that silky, almost frozen dessert texture, whereas lower powered machines may leave small icy bits. A frequent issue is overloading the blender with frozen fruit without enough liquid, which can stall the blades, so add a splash more water if you feel resistance.
If you do not have a high speed blender you might need to add more water to help it blend: The additional liquid reduces friction and lets the blades move freely, producing a smoother result at the expense of slight thinning. Use small increments, and pulse to check the changing texture, because you want to preserve thickness while preventing motor strain. The why here is both mechanical and sensory, smoother blends are silkier on the palate. People often dump too much liquid in at once, which is harder to correct than adding gradually.
To assemble the smoothie cut the tip off of the plastic piping bag filled with the blue green drizzle and pipe it around the sides of a glass: As you squeeze, watch the drizzle bead along the inside, leaving a marbled, watercolor trail that catches the light. This visual layering is what makes the drink feel special, and it also ensures each sip carries a touch of that nutty drizzle. If the drizzle resists flowing, warm the bag slightly in your hands, but not so much that it melts, because warmth will thin the paste too much. One misstep is cutting too large a hole, which causes heavy blobs instead of pretty lines, so start small and enlarge if necessary.
Pour the smoothie into the decorated glass then top with whipped cream if desired: Pour slowly so the liquid settles into the center, allowing the piped edges to remain visible. You will feel the glass cool in your hands, and as the surface levels you can use a spoon to nudge a small dome of whipped cream on top. This topping adds a soft, airy contrast that reads like a finishing flourish. Avoid overfilling the glass, which can cause the whipped cream to topple and lose its neat appearance.
Crush the freeze dried strawberries and blueberries between your fingers to create sprinkles on top of the whipped cream: The tiny crumble will feel light and powdery, and when scattered they add both texture and concentrated fruit flavor. These crumbs stay crisp, providing an exciting crunch against the smooth cream. Be gentle while crushing to control the particle size, because overly fine dust will sink into the cream while large chunks may be a mouthful too big.
Serve: immediately while the smoothie is cold and the drizzle still holds its shape. The contrast between chilled creaminess and crunchy sprinkles is at its peak right out of assembly, and flavors are brightest when not left to sit. A typical mistake is leaving assembled drinks to stand, which softens the drizzle and causes the toppings to absorb moisture, so plan to enjoy them promptly.