A gelatin unflavored Knox recipe that combines boxed flavored gelatin with plain Knox for a firm, clean-cutting set. Ready to cut into squares in about 4 hours, no special equipment needed.
Sprinkle both packets of unflavored Knox gelatin over the cold water in a large bowl. Let sit 5 minutes until thickened.
Add the 2 boxes of flavored gelatin powder to the bloomed Knox mixture.
Pour the boiling water over the gelatin mixture.
Whisk for 2 to 3 minutes until completely dissolved, with no granules remaining.
Set and Serve
Pour the mixture into a shallow 9x13-inch pan.
Refrigerate uncovered until the surface sets, then cover and chill at least 4 hours, or until fully firm.
Once fully set, cut into 1-inch squares with a sharp knife.
Serve straight from the pan or arrange squares on a plate, chilled.
Notes
Store covered in the refrigerator up to 1 week. For a firmer, cleaner cut, add a third packet of Knox. For a sugar-free version, use sugar-free flavored gelatin and skip the extra Knox packet -- one packet sets firm enough on its own.