Clean the strawberries and remove the stems (do not chop).
Mash the berries with a potato masher. Measure out exactly 5 cups of crushed berries. Add to a large heavy bottom pot.
Add the juice and zest of the lime and one teaspoon salt
Measure 1/4 cup of sugar and mix it with the contents of the Sure-Jell. Sprinkle it into the berry mixture and set it on the burner. Turn on high and bring to a boil, stirring constantly.
When it comes to a hard boil (one that you cannot stir down) add the remaining sugar.
Return it to a hard boil and boil exactly one minute.
Remove from the heat. With hot pan holders on immediately stir in 1/4 cup tequila. It will bubble and spit a bit! Continue to stir until it is completely incorporated, about a minute.
Ladle into clean, sterilized jars.
Using a paper towel clean the top of the jar off completely.
Add the lid and screw top. Screw the lid on tightly. Process in a hot water bath for 10 minutes to seal.
Remove from the hot water bath and place on a heat-proof surface. You'll hear the jars pop and you'll know they are sealed.