Throughout the years I've seen a lot of rainbow Jell-O and I've even eat some rainbow Jell-O. I never really thought about what the white stripes in between the colored Jell-O was until I decided to make it. When I saw that it was simply sweetened condensed milk and gelatin I was really surprised. I guess I shouldn't have been since sweetened condensed milk is used in so many recipes.
If you want to make this recipe you need to be aware of two things. It's a very easy process but it's quite time consuming. You need 15-20 minutes in between each layer and since I had 4 flavors of Jell-O I had seven layers total counting the white layers. It ended up taking me over 2 hours to complete the entire process. I will say they are super cute and my students absolutely loved them when I took them to school for a snack. I used sugar free Jell-O to keep the calories down.
I ended up using red, orange, green, and blue but you can use as many colors as you'd like. I took these in as for St. Patrick's day because of the rainbow connection but I think they'd be great for birthday parties or summer BBQ's as well.
Rainbow Jell-O Cups (from Taste of Home Cooking)
4 packages (3 oz. each) flavored Jell-O (I used lime, Berry Blue, strawberry, and peach)
6 envelopes Knox unflavored gelatin, divided
5-¾ c. boiling water, divided
1 can (14 oz) sweetened condensed milk
¼ c. cold water
12 plastic cups (at least 4 inches tall)
1. In a small bowl combine the Berry Blue Jell-o and one envelope of Knox gelatin. Stir in 1 cup of boiling water and stir until dissolved. Divide evenly into the 12 cups. Refrigerate for 15 minutes or until set but not firm.
2. In a small bowl combine the sweetened condensed milk and 1 cup of boiling water. In a second small bowl place the cold water. Sprinkle 2 packages of Knox gelatin over the cold water and let stand for 1 minute. Then stir in ¾ cup of boiling water. Add this to the milk mixture. Pour 1 cup of the milk and gelatin mixture into a liquid measuring cup ad pour evenly over top of the Berry Blue Jell-O cups. Refrigerate for 15 minutes or until set.
3. Repeat sets 1 and 2 again using the lime Jell-O and the peach Jell-O. Make the final layer with the strawberry Jell-O and refrigerate for at least 2 hours before serving.
**Note: These Jell-O cups can be made up to 3 days ahead of time.