1 (6 ounce) package strawberry-flavored gelatin (such as Jell-O®)
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1 (6 ounce) package lemon-flavored gelatin (such as Jell-O®)
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3 cups boiling water
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3 cups cold water
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6 fresh strawberries, sliced
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0.5 cup miniature marshmallows
Instructions
Mix strawberry-flavored gelatin and lemon-flavored gelatin together in a bowl; pour in the boiling water and stir until gelatin mixture is dissolved, at least 2 minutes. Pour the cold water into the mixture and stir until well combined.
Pour gelatin mixture into a mold or leave in the bowl and refrigerate until partially set, about 1 1/2 hours. Mix strawberries and marshmallows into gelatin mixture. Continue chilling until completely set, about 2 1/2 hours more.