To keep the watermelon bowls from moving around on the trays, you’ll have to create a bed with paper towels.
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First, line the bottom of each tray with two paper towels.
Then, put two folded paper towels on opposite sides of each tray. Your watermelon will lie in that gap in the middle.
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Add all of the Jell-O mix and all of the unflavored gelatin to your mixing bowl.
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Boxed Jell-O mix already has gelatin in it, but for this recipe you need to add extra, since you want extra-firm Jell-O shots that will hold the shape of the watermelon slices and look impressive and amazing.
Add 4 cups of boiling water and whisk together for 2 minutes, until all of the gelatin has dissolved.
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