Create the Creamy Mixture: In a large mixing bowl, whisk together the condensed milk, evaporated milk, and whole milk. Gradually whisk in the melted unflavored gelatin until the mixture is perfectly smooth.
The Assembly: Scatter your orange/mango jelly cubes into your large glass baking dish. Gently pour the creamy milk mixture over the top. If the cubes float, just give them a light tap with a spoon to distribute them.
The Set: Chill in the refrigerator for at least 4 to 6 hours (overnight is even better) until it is firm and bouncy.
A Quick Serving Tip
To get those beautiful, clean slices shown in your photo, dip your serving spatula in warm water before lifting the first piece out. It helps the creamy base release cleanly from the dish.
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