Soften the gelatin in 1/2 of the juice. Boil the remaining juice and sugar to concentrate it, about 15 min.

Reserve 1/4 cup of cornstarch and mix the rest with the lemon and lime juices, and then add the gelatin mixture.

Add to the boiled juice and bring to a boil again, stirring constantly about 10 minutes, or until thickened. Test the sweetness, adding more lemon juice if needed.

Mix in nuts.

Pour into a 9x9x2 baking pan, lightly greased, lined with waxed paper, parchment or plastic wrap.Cover to protect from dust or bugs.

Let harden overnight or about 12 hours. Cut into 1 squares using a pizza cutter.

Remove squares with a spatula and roll in the sugar mixture (the cornstarch keeps the sugar dry).

Roll again before serving, or gift-giving, if needed.