Prepare the strawberries:

First, cap washed strawberries, and then crust. You can do this by pulsing in a food processor, roughly chopping, then mashing with a potato masher, or, as shown in the video below, using an immersion blender. I like this method because it’s faster, and cleanup is easier. 

Prepare the jalapeños:

Cut stems from washed jalapeños, and deseed. Dice finely, or, pulse in food process. This method however, can result in some pieces being left larger, so beware if large pieces of jalapeño in your jam is a concern, you are better off using a knife and cutting board. 

Make the jam:

1. Combine prepared strawberries and jalapeños in a large (at least four quart) saucepan
2. Stir in fruit pectin, and heat over medium-high heat until mixture reaches a full boil
3. Add sugar all at once, and stir until dissolved
4. Bring mixture back to a full, rolling boil that can’t be stirred down, and boil for exactly one minute
5. Remove from stove, and skim foam from the top. You can transfer this foam to a bowl or container to use later. 

To Can:

1. After skimming foam from jam, ladle into sterilized jelly jars, leaving 1/2 inch of headspace 
2. Wipe rims of jars with a soft cloth to remove any debris that might inhibit a seal
3. Screw down lids and rings firmly
4. Fill water bath kettle with hot water, making sure the kettle has a canning rack in the bottom
5. Place jars of jam into the kettle. Make sure they are covered by at least an inch of water
6. Place lid on kettle, and heat over medium-high heat to a rolling boil
7. Process pints for 15 minutes, or half pints for 10 minutes
8. Remove kettle from heat, and let cool with lid on for at least an hour
9. After an hour, you may remove lid to speed up cooling
10. If needed, you can remove hot jars from the kettle, protecting from drafts, which could cause jars to break, with a towel. 
11. Place on a counter to pot table, covered with a towel, and let cool completely
12. After 24 hours, check for seals, wash jars if needed, and store in a cool place out of direct light