1-Step 1: Prepare Your Workspace and Pan Start by gathering all your ingredients and equipment. You’ll need a 9×13-inch pan, measuring cups, mixing bowls, a whisk, and a paring knife for cutting. Clear space in your refrigerator where the pan can sit flat without being disturbed. Having everything ready before you begin makes the process smoother and helps you work efficiently between layers.

2-Step 2: Create the First Colored Layer Dissolve one 3-ounce package of grape-flavored gelatin with 1 teaspoon of unflavored gelatin in 1 cup of boiling water. Stir until completely dissolved this usually takes about 2 minutes of continuous whisking. Pour the mixture into your 9×13-inch pan, ensuring it sits flat on a level surface. Refrigerate for approximately 30 minutes until the layer is fully set. You can test by gently touching the surface; it should feel firm and not sticky.

3-Step 3: Add the First White Layer Once your first colored layer has set completely, prepare the next colored layer using the same method. Allow it to cool slightly before pouring. Pour three-fourths cup of the white mixture over the set colored layer, tilting the pan gently to distribute it evenly across the surface. Refrigerate for about 20 minutes until this white layer is firm to the touch.

4-Step 4: Continue Layering Alternate between colorful flavored layers and creamy white layers, following the ROY-G-BIV rainbow order: red (raspberry, cherry, or strawberry), orange, yellow (lemon), green (lime), blue (berry blue), and purple (grape). Skip indigo since most gelatin brands don’t offer that flavor. Let each layer set before adding the next this typically takes 20-30 minutes per colored layer and 15-20 minutes per white layer. The white layer must be made multiple times since it’s used five times in total throughout the recipe. If the white mixture begins to set while you’re waiting between layers, simply warm the bowl in hot water and stir until it returns to a smooth, pourable consistency.

5-Step 5: Final Layer and Setting After adding your final purple layer, refrigerate the entire pan for at least 4 hours or overnight for the best results. The complete setting time allows all layers to bond properly, making cutting easier and cleaner. The total preparation time includes approximately 15 minutes of active work and around 4 hours of setting time, for a total of about 4 hours and 15 minutes.

6-Step 6: Cutting and Serving Once all layers have set completely, remove the pan from the refrigerator. Slice the gelatin into 1-inch squares using a paring knife for the cleanest cuts. Dip the knife in hot water between cuts and wipe dry for smooth edges. Use a small spatula to carefully remove cubes from the pan. For the neatest presentation, work quickly while the gelatin is cold, and serve immediately on a platter or individual plates.