Begin by combining freshly squeezed orange juice and pineapple juice in a blender. Blend the mixture on high for about 30 seconds until smooth and vibrant.

Take a tall glass and fill it generously with crushed ice, packing it down slightly.

Gently pour the blended juice mixture over the crushed ice in the glass, allowing the juice to cascade down.

Using a spoon, hold it above the liquid's surface and slowly drizzle the grenadine down the back of the spoon.

Garnish your mocktail with a slice of orange or a pineapple wedge perched on the rim of the glass. Optionally add a maraschino cherry.