You will need to start preparing this dessert the day before the birthday party, picnic, or event that you are making it for.
Begin by dissolving each pack of jello into 1 cup of boiling water. Ensure that you do not follow the instructions on the jello packet as the terrazzo jello needs to be more concentrated to create a firmer texture.
Pour each mixture into a separate tray with the jello no more than 1-inch deep. Our enamel serving trays
or square bake trays
are a great size for the jello to set in.
Place the trays of jello into the fridge and allow to set for 2-3 hours.
Carefully cut the jello into small cubes using a sharp knife.
Next, dissolve the packet of unflavoured gelatine in 2 cups of hot water. Allow this mixture to cool and then whisk in the can of sweetened condensed milk.
Leave this mixture until it is completely cool to the touch.
Place the colourful cubes of jello in an even layer in the square bake tray
and then pour over the condensed milk mixture. This is a child-friendly step and allows your children to use their creativity to design a colourful pattern.
Cover your enamel square bake tray
and leave it to chill in the fridge overnight.
Cut into squares and serve to your party guests.