1. Mash berries in large pot on stove with a potato masher.
2. Set heat to low to soften and coax the juices out of fruit.
3. Place sugar and water into pot. Bring to boil while constantly stirring.
4. Add lemon juice and zest. Return to a boil.
5. Cook for 15 minutes until thickened, continually stirring.
Pour into hot sterilized jars, leaving 1/4″ clearance on top.
7. Clean rims and tighten lids. Place jars in boiling water bath for 10 minutes.