Start by blooming the unflavored gelatin in water, whisking to evenly combine and letting it sit for about 5 minutes until it thickens and becomes gummy.
Heat the fruit juice in a saucepan over medium heat until warm (just below boiling), then remove from heat.
Add the bloomed gelatin to the warm juice, whisking until fully dissolved and smooth. This creates a vibrant, colored gelatin base.
Pour the gelatin mixture into a lightly greased brain-shaped mold, filling it about halfway. Chill in the refrigerator for 20 minutes until set but still slightly wobbly.
Meanwhile, warm the white fruit juice in the saucepan, then add dissolved gelatin until smooth. Let it cool slightly.
Pour this white gelatin over the partially set pink layer, gently covering it without disturbing the previous layer. Return to the refrigerator and chill until firm, about 20 minutes.
To create the blood veins, gently swirl red fruit juice or food coloring into a small amount of warm gelatin, then quickly pipe or spoon thin lines over the top of the set gelatin, mimicking blood vessels.
Refrigerate the assembled mold for another 30 minutes until completely set and firm.
To serve, gently unmold the gelatin by briefly warming the outside of the mold in warm water, then carefully invert onto a serving plate. Slice to reveal the intricate brain-like layers.
Enjoy your spooky, gelatinous Halloween brain, a fun and squishy centerpiece for your party!
