How to Dissolve JELL-O Gelatin
If you've added the water to the dry JELL-O Gelatin and cannot get the gelatin to completely dissolve, place the gelatin mixture in a microwaveable bowl and microwave on HIGH 30 sec. This should bring up the temperature of the water to a point where it is hot enough to completely dissolve the gelatin crystals.
Gelatin mixtures can be prepared a day ahead.
If you can only find a 10-oz. can of evaporated milk, measure out 2/3 cup for use in making this recipe. Store leftover milk in tightly covered container in the refrigerator for other uses, such as to flavor coffee, smoothies or other beverages.