Cut your watermelon into chunks and blend in a blender.
Run the blended watermelon over a strainer several times to remove any remaining seeds or big chunks, until you have a nice smooth juice.
Wearing gloves, de-seed and mince your jalapeños.
Add the jalapeño bits to the watermelon juice.
Sprinkle the pectin on the bottom of your jam and jelly maker.
Add the watermelon jalapeño mixture.
Add ¼ teaspoon of butter.
Add the ¼ cup lemon juice.
If using the jam maker, turn it on and let it mix for four minutes until it beeps, then add the sugar.
Let the jam maker run for 28 minutes.
When your jelly is done, skim the foam off the top and preserve by either placing in the fridge, freezing, or canning.
