Select unripe tomatillos. Remove husks, rinse, and rough chop fruit.

Remove the rind from one lime. Cut lime peel into very thin strip, Then juice lime.

Add rind, lime juice, sugar, salt, and water to tomatillos. Set saucepan over medium-high heat. Let mixture come to a simmer, stirring occasionally.

Cook until mixture thickens and forms a soft jam. Ladle jam into hot, sterilized jars. Makes about 1 1/2 cups jam.