I've made this many times, and it turns out perfect every time if you follow directions. I was sick this weekend, but needed to get it done. I thought I would save time and mixed the lemon juice in with the fruit before adding the Certo. It did not set, but that's ok. I'll use it over ice cream, pound cake, and homemade yogurt. Made it tonight and mixed the lemon juice with the Certo first and pow - perfect set.