How To Release Jell O From A Silicone Tray
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In general, it's easier to remove food from silicone trays. Any shape works for JELL-O, but when it sticks to the trays or molds containing them, it can rip. After JELL-O rips, you can't repair it—it will only lose its shape. The best time to remove it is when it's completely cooled and formed, otherwise you risk causing a liquidly mess.

Step 1:

Put a sink topper in a sink to close the drain.

Step 2:

Fill the sink with two inches of hot water.

Step 3:

Hold the bottom of the silicone tray containing the Jell-O in the water for 20 seconds. Do not completely submerge the tray.

Step 4:

Turn the silicone tray upside down over a plate. The JELL-O will slide out onto the plate.