I made this today. I used 1-cup boiling water to disolve the Jello. Then, I was afraid to add cold yogurt to the hot mixture. Why? I thought it might curdle or something. Anyhow, I cooled it a bit with one ice cube. Since someone wrote to use 1&1/2 cups boiling water instead of the 1-cup, I figured I had some leeway. Then I added the yogurt. I was so disappointed that it didn't jell. I wanted to take to my Lutheran Church Charity Quilting Bee today. So I left it in the refrigerator and checked on it when I returned. Duh! It wasn't instant pudding....no where did ya'll write it would jell immediately. It is wonderful. I love it. I'll be making this forever. I can't have milk (so no ice cream or pudding) and this really makes up for the loss. Thanks so much.