Cook everything: Cut up the strawberries into chunks and add it along with the other berries, sugar, and lemon juice to a medium-large pot and stir it all together. Then place the pot over high heat until it comes to a boil. Once everything comes to a boil lower the heat and let it all simmer for about 30 minutes to an hour making sure to stir the ingredients every 5 to 10 minutes.

Prep/sanitize the jars: While the jam is simmering let’s get to prepping/sanitizing our jars. For starters, we will want to set our oven to 250 degrees Fahrenheit. Once it has reached that temperature place the jars on a baking sheet and into the oven for a minimum of 20 minutes. We will also need to sanitize the lids. To do this get out a small bowl and get some water boiling on a kettle. Then place the lids in the bowl and pour the boiling water over them so that they are completely covered with water. Let this sit for a minimum of 15 minutes.

Test to see if the jam is ready: Now that our jars are sanitized and our jam has been simmering for about 30 minutes it’s time to see if it’s ready to be jarred. There are two ways to do this. First is to place a spoon into the jam, if it sticks to the back and only slowly drips off of the spoon then it should be ready. However, if you are looking for a more scientific way to test the doneness of the jam then simply stick a candy thermometer in it and wait until it reads 220 degrees Fahrenheit.

Jar the jam: Get out your sanitized jars from the oven and dry off the lids that have been soaking the hot water. Then place a funnel over one of the jars and slowly pour the jam into the jar. But don’t fill it up all the way, make sure to leave about ½ an inch of space at the top or else the jars might not seal properly. Repeat this step until all of the jam is in jars. Then place the lids on all of the jars and secure them to the jars by screwing on the outer band. Let these sit on your counter until the lids pop down into the jars and are sealed.

Store the jarred four berry jam in a cold dark place for up to 6 months and use it as needed.