Clean and cut the jalapenos into small pieces, then add everything to a sauce pan and on medium heat, cook for 30 minutes, stirring occasionally until it thickens to a jam like consistency. If it doesn't get thick enough, simply cook for a bit longer so it reduces and thickens. No need to add cornstarch etc.

Transfer to sterilized jars to can.

**** You can add some food coloring to change the color of it if you wish (whilst it is cooking)